remote, #528: Fix regression shadowing exceptions

Author: guyzmo

Diff for: git/remote.py

@@ -511,6 +511,8 @@ def urls(self):
                 for line in remote_details.split('\n'):
                     if '  Push  URL:' in line:
                         yield line.split(': ')[-1]
+            else:
+                raise ex
 
     @property
     def refs(self):