diff -r 9ced12c28e05 tools/python/xen/xend/XendConfig.py
--- a/tools/python/xen/xend/XendConfig.py	Wed Jul 22 14:37:30 2009 +0100
+++ b/tools/python/xen/xend/XendConfig.py	Thu Jul 23 11:15:59 2009 +0900
@@ -2087,7 +2087,7 @@
     def handle_fileuris(self):
         for arg in [('PV_kernel', 'use_tmp_kernel'), 
                     ('PV_ramdisk', 'use_tmp_ramdisk')]:
-            if self[arg[0]] != None:
+            if self[arg[0]]:
                 self[arg[0]], self[arg[1]] \
                     = xen.util.fileuri.schemes.decode(self[arg[0]])
                 log.debug("fileuri '%s' = '%s'" % (arg[0], self[arg[0]][:100]))