Doing a PoC with Route + ExternalName Services causes error in CIS

#### Setup Details
 Build: Version: 2.20.1, BuildInfo: azure-7645-383b7cb7252e831bfc8ace1a4e5ff56e464789ef
 BIGIP Version: Big IP 21.0.0
 AS3 Version: 3.55      
 Agent Mode: AS3
 Orchestration: OSCP      
 Orchestration Version: 4.19       
 Pool Mode: Cluster      
 Additional Setup details: OVN

#### Description  

The following is not affecting a customer. I just wanted to report this non usual configuration failure I found while trying a PoC with the following config which uses a Service of type ExternalName:

```
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: flights-mcp-server
  namespace: mcp-shared
  annotations:
     virtual-server.f5.com/health: |
        [
           {
              "interval": 5,
              "timeout": 16,
              "type": "tcp",
           }
        ]
spec:
  host: flights-mcp-server.f5demo.com
  to:
    kind: Service
    name: flights-mcp-server
---
apiVersion: v1
kind: Service
metadata:
  name: flights-mcp-server
  namespace: mcp-shared
spec:
  type: ExternalName
  externalName: flights-mcp-server.flights-mcp-server.svc.cluster.local # FQDN of the Service in the other namespace
```
  
crashes CIS with the following logs

```
2025/11/18 15:14:29 [DEBUG] [CORE] Periodic enqueue of Service from Namespace: flights-mcp-server, svc: flights-mcp-server
2025/11/18 15:14:29 [DEBUG] [CORE] Finished syncing namespace flights-mcp-server (56.262µs)
2025/11/18 15:14:29 [DEBUG] [CORE] Periodic enqueue of Service from Namespace: formula1-mcp-server, svc: f1-mcp-server
2025/11/18 15:14:29 [DEBUG] [CORE] Finished syncing namespace formula1-mcp-server (24.382µs)
2025/11/18 15:14:29 [DEBUG] [CORE] Finished syncing virtual servers with service flights-mcp-server in namespace mcp-shared (34.873µs), processed VS 1 out of 7
2025/11/18 15:14:29 [DEBUG] [CORE] Periodic enqueue of Service from Namespace: mcp-shared, svc: flights-mcp-server
2025/11/18 15:14:29 [DEBUG] [CORE] Finished syncing namespace mcp-shared (14.55µs)
E1118 15:14:29.769818       1 runtime.go:78] Observed a panic: runtime.boundsError{x:0, y:0, signed:true, code:0x0} (runtime error: index out of range [0] with length 0)
goroutine 661 [running]:
k8s.io/apimachinery/pkg/util/runtime.logPanic({0x238cf60, 0xc0016aa660})
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:74 +0xf4
k8s.io/apimachinery/pkg/util/runtime.HandleCrash({0x0, 0x0, 0x0})
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:48 +0xb6
panic({0x238cf60?, 0xc0016aa660?})
        /usr/local/go/src/runtime/panic.go:791 +0x136
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/resource.GetServicePort({0xc00084d3a0, 0xa}, {0xc0008d6828, 0x12}, {0x26944d0, 0xc000886948}, {0x0, 0x0}, {0x249408d, 0x5})
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/resource/resourceConfig.go:2596 +0x5d1
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).createRSConfigFromRoute(_, _, {_, _}, _, {{0x7ffe17faed15, 0xe}, {0x0, 0x0}, {0x7ffe17faecef, ...}, ...}, ...)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/resourceConfig.go:64 +0x4ef
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).syncRoutes(0xc000734008, 0xc0007f33b8, {{0xc00084d3a0, 0xa}, {0xc0008d6828, 0x12}, {0x24949cb, 0x6}, {0xc0008d6750, 0x12}, ..
.}, ...)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:2296 +0x18c5
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).syncVirtualServer(0xc000734008, {{0xc00084d3a0, 0xa}, {0xc0008d6828, 0x12}, {0x24949cb, 0x6}, {0xc0008d6750, 0x12}, {0x24949c5, ...}, ...})
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1609 +0x1830
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).processNextVirtualServer(0xc000734008)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1451 +0xa05
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).virtualServerWorker(0xc000734008)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1320 +0x1f
k8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1(0xc0007dd510)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:155 +0x39
k8s.io/apimachinery/pkg/util/wait.BackoffUntil(0xc0007dd510, {0x2672ac0, 0xc00158d740}, 0x1, 0xc00087e070)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:156 +0xbb
k8s.io/apimachinery/pkg/util/wait.JitterUntil(0xc0007dd510, 0x3b9aca00, 0x0, 0x1, 0xc00087e070)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133 +0x76
k8s.io/apimachinery/pkg/util/wait.Until(0xc0007dd510, 0x3b9aca00, 0xc00087e070)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:90 +0x2d
created by github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).runImpl in goroutine 110
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1265 +0x40f
panic: runtime error: index out of range [0] with length 0 [recovered]
        panic: runtime error: index out of range [0] with length 0

goroutine 661 [running]:
k8s.io/apimachinery/pkg/util/runtime.HandleCrash({0x0, 0x0, 0x0})
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:55 +0x154
panic({0x238cf60?, 0xc0016aa660?})
        /usr/local/go/src/runtime/panic.go:791 +0x136
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/resource.GetServicePort({0xc00084d3a0, 0xa}, {0xc0008d6828, 0x12}, {0x26944d0, 0xc000886948}, {0x0, 0x0}, {0x249408d, 0x5})
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/resource/resourceConfig.go:2596 +0x5d1
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).createRSConfigFromRoute(_, _, {_, _}, _, {{0x7ffe17faed15, 0xe}, {0x0, 0x0}, {0x7ffe17faecef, ...}, ...}, ...)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/resourceConfig.go:64 +0x4ef
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).syncRoutes(0xc000734008, 0xc0007f33b8, {{0xc00084d3a0, 0xa}, {0xc0008d6828, 0x12}, {0x24949cb, 0x6}, {0xc0008d6750, 0x12}, ...}, ...)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:2296 +0x18c5
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).syncVirtualServer(0xc000734008, {{0xc00084d3a0, 0xa}, {0xc0008d6828, 0x12}, {0x24949cb, 0x6}, {0xc0008d6750, 0x12}, {0x24949c5, ...}, ...})
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1609 +0x1830
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).processNextVirtualServer(0xc000734008)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1451 +0xa05
github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).virtualServerWorker(0xc000734008)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1320 +0x1f
k8s.io/apimachinery/pkg/util/wait.BackoffUntil.func1(0xc0007dd510)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:155 +0x39
k8s.io/apimachinery/pkg/util/wait.BackoffUntil(0xc0007dd510, {0x2672ac0, 0xc00158d740}, 0x1, 0xc00087e070)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:156 +0xbb
k8s.io/apimachinery/pkg/util/wait.JitterUntil(0xc0007dd510, 0x3b9aca00, 0x0, 0x1, 0xc00087e070)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133 +0x76
k8s.io/apimachinery/pkg/util/wait.Until(0xc0007dd510, 0x3b9aca00, 0xc00087e070)
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:90 +0x2d
created by github.com/F5Networks/k8s-bigip-ctlr/v2/pkg/appmanager.(*Manager).runImpl in goroutine 110
        /go/src/github.com/F5Networks/k8s-bigip-ctlr/pkg/appmanager/appManager.go:1265 +0x40f
```


#### Steps To Reproduce
1) use CIS with the following parameters

```
              "--namespace=mcp-shared",
              "--namespace=flights-mcp-server",
              "--namespace=formula1-mcp-server",
              "--bigip-partition=f5-cis",
              "--pool-member-type=cluster",
              "--share-nodes=true",
              "--log-level=AS3DEBUG",
              "--insecure=true",
              "--manage-routes=true",
              "--route-http-vserver=vs-mcp-openshift",
              "--route-vserver-addr=192.170.34.212",
              "--orchestration-cni=ovn-k8s",
              "--static-routing-mode=true",
              "--as3-validation=true",
              "--log-as3-response=true",
              "--override-as3-declaration=mcp-shared/cis-configmap"
```

2) Use the K8s resources above

#### Expected Result 

The service lookup of flights-mcp-server should succeed

#### Actual Result  

CIS crashes



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Doing a PoC with Route + ExternalName Services causes error in CIS #4004

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Doing a PoC with Route + ExternalName Services causes error in CIS #4004

Description

Setup Details

Description

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Expected Result

Actual Result

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