--- a/hgext/convert/convcmd.py	Fri Mar 13 14:20:13 2015 -0400
+++ b/hgext/convert/convcmd.py	Fri Mar 13 17:00:06 2015 -0400
@@ -515,7 +515,11 @@
     sortmode = [m for m in sortmodes if opts.get(m)]
     if len(sortmode) > 1:
         raise util.Abort(_('more than one sort mode specified'))
-    sortmode = sortmode and sortmode[0] or defaultsort
+    if sortmode:
+        sortmode = sortmode[0]
+    else:
+        sortmode = defaultsort
+
     if sortmode == 'sourcesort' and not srcc.hasnativeorder():
         raise util.Abort(_('--sourcesort is not supported by this data source'))
     if sortmode == 'closesort' and not srcc.hasnativeclose():