Update parse_cors function to work for edge case when nothing is provided after or between commas

Author: rolkotaki

backend/app/core/config.py

@@ -20,7 +20,7 @@ def parse_cors(v: Any) -> list[str] | str:
     if isinstance(v, str) and not v.startswith("["):
         if not v.strip():
             return []
-        return [i.strip() for i in v.split(",")]
+        return [i.strip() for i in v.split(",") if i.strip()]
     elif isinstance(v, list | str):
         return v
     raise ValueError(v)