fixed syntax problems with previous python versions, added additional error messages

userconfig/__init__.py

@@ -28,11 +28,11 @@ class Userconfig:
         if not os.path.isfile(package_config_file):
             self._cfg.debug.stdout(f'No config file {self._cfg.get("configfile")} in {package_dir}, skipping',
                                    0, 'ERROR')
-            return None
+            return None, None
         dir_config = self.get_config(package_config_file)
         if not dir_config:
             self._cfg.debug.stdout(f'Cannot read config file {package_config_file}, skipping', 0, 'ERROR')
-            return None
+            return None, None
         classes = []
         for category in os.scandir(package_dir):
             if category.path == package_config_file: