Filtered out "repository" more explicitly

Author: benthayer

Diff for: git/config.py

@@ -281,7 +281,7 @@ def __init__(self, file_or_files=None, read_only=True, merge_includes=True, conf
         else:
             if config_level is None:
                 if read_only:
-                    self._file_or_files = [get_config_path(f) for f in CONFIG_LEVELS[:-1]]
+                    self._file_or_files = [get_config_path(f) for f in CONFIG_LEVELS if f != 'repository']
                 else:
                     raise ValueError("No configuration level or configuration files specified")
             else: