--- a/mercurial/hg.py	Fri Mar 13 14:20:13 2015 -0400
+++ b/mercurial/hg.py	Fri Mar 13 17:00:06 2015 -0400
@@ -34,7 +34,11 @@
         else:
             y = None
         return x, y
-    revs = revs and list(revs) or []
+    if revs:
+        revs = list(revs)
+    else:
+        revs = []
+
     if not peer.capable('branchmap'):
         if branches:
             raise util.Abort(_("remote branch lookup not supported"))