Correct use of not in if statement

FeedToRocket.py

@@ -718,7 +718,7 @@ def process_gitea(conf, one_shot, domain_cache):
                     log.exception("Error upgrading tag-only entry to a commit/compare diff")
             
             #Make sure repo is set in some way:
-            if ! repo:
+            if not repo:
                 repo = ''
             # Clean author & title; extract commit message
             author = clean_author(author_raw)