fix missing except block

web_app.py

@@ -832,6 +832,11 @@ def api_create_from_modelfile():
             'job_id': job_id,
             'message': 'Installation started'
         })
+        
+    except Exception as e:
+        return jsonify({'error': str(e)}), 500
+
+
 @app.route('/api/install/modelfile', methods=['POST'])
 def api_install_from_modelfile():
     """Start installation of a model from an existing Modelfile as background job."""