do not die when an extension's repo has no remote

modules/extensions.py

@@ -34,8 +34,11 @@ class Extension:
         if repo is None or repo.bare:
             self.remote = None
         else:
+            try:
                 self.remote = next(repo.remote().urls, None)
                 self.status = 'unknown'
+            except Exception:
+                self.remote = None
 
     def list_files(self, subdir, extension):
         from modules import scripts