Fix logic in doc impact

Previous patch was supposed to update notify_impact
so that doc impact flags only triggered bugs on change
merge. This worked, however the branch logic was flawed,
meaning that non-merging changes now trigger emails.

This patch fixes for the desired behaviour

Change-Id: I3b028319c026bce84d4641e417aed9e8e0f52063
diff --git a/jeepyb/cmd/notify_impact.py b/jeepyb/cmd/notify_impact.py
index 0f81b1c..af1ad8a 100644
--- a/jeepyb/cmd/notify_impact.py
+++ b/jeepyb/cmd/notify_impact.py
@@ -85,8 +85,9 @@
     For non-documentation impacts at all states of merge
     notify the mailing list of impact.
     """
-    if args.impact.lower() == 'docimpact' and args.hook == "change-merged":
-        create_bug(git_log, args, 'openstack-manuals')
+    if args.impact.lower() == 'docimpact':
+        if args.hook == "change-merged":
+            create_bug(git_log, args, 'openstack-manuals')
         return
 
     email_content = EMAIL_TEMPLATE % (args.impact,