Ruff after aider

aider_gitea/__main__.py

@@ -47,13 +47,11 @@ def parse_args():
     )
     parser.add_argument(
         '--code-model',
-        default='o4-mini',
+        help='Override the default model used for code generation (default: o4-mini)',
-        help='Aider code model to use (default: o4-mini)',
     )
     parser.add_argument(
         '--evaluator-model',
-        default='ollama/gemma3:27b',
+        help='Override the default evaluator model (default: ollama/gemma3:27b)',
-        help='Evaluator model to use for verification (default: ollama/gemma3:27b)',
     )
     return parser.parse_args()
 
@@ -61,10 +59,13 @@ def parse_args():
 def main():
     logging.basicConfig(level='INFO')
     args = parse_args()
+
     import aider_gitea as ag
 
-    ag.CODE_MODEL = args.code_model
+    if args.code_model:
-    ag.EVALUATOR_MODEL = args.evaluator_model
+        ag.CODE_MODEL = args.code_model
+    if args.evaluator_model:
+        ag.EVALUATOR_MODEL = args.evaluator_model
 
     seen_issues_db = SeenIssuesDB()
     client = GiteaClient(args.gitea_url, secrets.gitea_token())