hgext/keyword.py

--- a/hgext/keyword.py	Sat Mar 10 16:17:51 2018 -0800
+++ b/hgext/keyword.py	Sat Mar 10 20:16:20 2018 -0800
@@ -624,6 +624,9 @@
         res = orig(web, req, tmpl)
         if res is web.res:
             res = res.sendresponse()
+        elif res is True:
+            return
+
         for chunk in res:
             yield chunk
     finally: