Add 'rosdistro sync' to the commit message when no rosdistro has been…

… selected (ros-infrastructure#196)

Signed-off-by: Hunter L. Allen <hunterlallen@protonmail.com>

superflore/generators/ebuild/overlay_instance.py

@@ -39,8 +39,10 @@ def commit_changes(self, distro):
         info('Committing to branch {0}...'.format(self.branch_name))
         if distro == 'all':
             commit_msg = 'regenerate all distros, {0}'
-        else:
+        elif distro:
             commit_msg = 'regenerate ros-{1}, {0}'
+        else:
+            commit_msg = 'rosdistro sync, {0}'
         commit_msg = commit_msg.format(time.ctime(), distro)
         self.repo.git.commit(m='{0}'.format(commit_msg))