--- a/mercurial/hgweb/wsgicgi.py	Sat Dec 01 19:19:08 2007 +0100
+++ b/mercurial/hgweb/wsgicgi.py	Sun Dec 02 10:12:26 2007 +0100
@@ -16,9 +16,7 @@
     util.set_binary(sys.stdout)
 
     environ = dict(os.environ.items())
-    if 'PATH_INFO' not in environ:
-    	environ['PATH_INFO'] = ''
-
+    environ.setdefault('PATH_INFO', '')
     environ['wsgi.input'] = sys.stdin
     environ['wsgi.errors'] = sys.stderr
     environ['wsgi.version'] = (1, 0)