catch specific exception

Author: Vladimir Kotal

tools/sync/mirror.py

@@ -125,7 +125,7 @@
         if config['projects']:
             if config['projects'][args.project]:
                 project_config = config['projects'][args.project]
-    except:
+    except KeyError:
         # The project has no config, that's fine - defaults will be used.
         pass