disallow empty names

Author: Kr0nox

src/features/dfdElements/editLabelValidator.ts

@@ -27,7 +27,7 @@ export class DfdEditLabelValidator implements IEditLabelValidator {
         }
 
         const labelParent = label.parent;
-        if (!(labelParent instanceof SEdgeImpl) || !value) {
+        if (!(labelParent instanceof SEdgeImpl)) {
             return { severity: "ok" };
         }
 
@@ -36,6 +36,11 @@ export class DfdEditLabelValidator implements IEditLabelValidator {
             return { severity: "error", message: "Input name cannot contain spaces" };
         }
 
+        // Labels on edges are not allowed to be empty
+        if (value.length == 0) {
+            return { severity: "error", message: "Input name cannot be empty" };
+        }
+
         // Get node and edge names that are in use
         const edge = labelParent;
         const edgeTarget = edge.target;