fixed logic for json loading

Author: a0x1ab

src/authV2/azext_authV2/custom.py

@@ -161,7 +161,10 @@ def update_auth_settings_v2(cmd, resource_group_name, name, set_string=None, ena
             existing_auth["globalValidation"] = {}
         try:
             parsed = json.loads(excluded_paths)
-            excluded_paths_list = parsed if isinstance(parsed, list) else excluded_paths.split(",")
+            if isinstance(parsed, list):
+                excluded_paths_list = parsed
+            else:
+                excluded_paths_list = [parsed] if parsed else []
         except json.JSONDecodeError:
             excluded_paths_list = excluded_paths.split(",")