Fix minor errors in vscode and gimp about path and postconfig

desktop_env/evaluators/metrics/vscode.py

@@ -49,6 +49,8 @@ def check_json_settings(actual: str, expected: str, **options) -> float:
     Return:
         float: the score
     """
+    if not actual:
+        return 0.
 
     with open(actual, 'r') as f:
         data = json.load(f)