Fix bug in Repository#create_status

sigmavirus24 · sigmavirus24 · commit 78731e25bf2a · 2015-11-01T14:06:03.000-06:00
This meant that even in the failure case we returned a Status object
diff --git a/github3/repos/repo.py b/github3/repos/repo.py
@@ -953,7 +953,7 @@ def create_status(self, sha, state, target_url=None, description=None,
         :returns: the status created if successful
         :rtype: :class:`~github3.repos.status.Status`
         """
-        json = {}
+        json = None
         if sha and state:
             data = {'state': state, 'target_url': target_url,
                     'description': description, 'context': context}
