Tweaked a log.assertion() case.

- Legacy-Id: 17793

ietf/submit/utils.py

@@ -133,7 +133,7 @@ def validate_submission_rev(name, rev):
 
         expected = 0
         existing_revs = [int(i.rev) for i in Document.objects.filter(name=name) if i.rev and i.rev.isdigit() ]
-        unexpected_revs = [ i.rev for i in Document.objects.filter(name=name) if not (i.rev and i.rev.isdigit()) ] # pyflakes:ignore
+        unexpected_revs = [ i.rev for i in Document.objects.filter(name=name) if i.rev and not i.rev.isdigit() ] # pyflakes:ignore
         log.assertion('unexpected_revs', [])
         if existing_revs:
             expected = max(existing_revs) + 1