--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -139,7 +139,7 @@ class queue:
# when looking for tags (subject: from: etc) they
# end once you find a blank line in the source
format = "tagdone"
- else:
+ elif message or line:
message.append(line)
comments.append(line)