Improve CONTENT environment variable handling

- Update endpoint to check for both None and empty string values
- Add more detailed error message for better user experience
- Update documentation to reflect the refined behavior

app/api/v1/env_vars.py

@@ -10,7 +10,8 @@ router = APIRouter()
     "/env/content",
     response_model=Dict[str, str],
     summary="Get content from CONTENT environment variable",
-    description="Returns the value of the CONTENT environment variable"
+    description="Returns the value of the CONTENT environment variable "
+               "if set and not empty"
 )
 def get_content_env_var():
     """
@@ -20,14 +21,14 @@ def get_content_env_var():
         dict: A dictionary containing the CONTENT environment variable value
         
     Raises:
-        HTTPException: If the CONTENT environment variable is not set
+        HTTPException: If the CONTENT environment variable is not set or is empty
     """
     content_value = os.environ.get("CONTENT")
     
-    if content_value is None:
+    if content_value is None or content_value == "":
         raise HTTPException(
             status_code=status.HTTP_404_NOT_FOUND,
-            detail="CONTENT environment variable is not set"
+            detail="CONTENT environment variable is not set or is empty"
         )
         
     return {"content": content_value}