--- a/hgext/convert/common.py	Sun Feb 08 13:46:04 2009 +0100
+++ b/hgext/convert/common.py	Wed Feb 11 21:47:57 2009 +0100
@@ -325,7 +325,7 @@
         self._read()
 
     def _read(self):
-        if self.path is None:
+        if not self.path:
             return
         try:
             fp = open(self.path, 'r')