Fix subcommands without --add-url option

'git bz add-url'  was dying because the code was expecting all subcommands
to have an --add-url option but add-url doesn't.

1 files changed, 1 insertions, 1 deletions

diff --git a/git-bz b/git-bz
index 4d39dba..d109f3b 100755
--- a/git-bz
+++ b/git-bz
@@ -1972,7 +1972,7 @@ else:
 
 global_options, args = parser.parse_args()
 
-if global_options.add_url is None:
+if hasattr(global_options, 'add_url') and global_options.add_url is None:
     global_options.add_url = True
 
 if len(args) < min_args or len(args) > max_args: