Fix issue with first release logic

We need to use .get('releases') in order to get a None value back
instead of a KeyError, as is expected by the logic here.

Change-Id: Iaabf8dd309130ab609c26b01475cf5e0ae0a44dc

openstack_releases/cmds/new_release.py

@@ -251,7 +251,7 @@ def main():
         error(e)
 
     # Ensure we have a list for releases, even if it is empty.
-    if deliverable_info['releases'] is None:
+    if deliverable_info.get('releases') is None:
         deliverable_info['releases'] = []
 
     try: