[jhbuild] fix calling config.load() without parameter (fix buildbot server)

[Frederic Peters <fpeters src gnome org>]

commit 9d8543fb70bfeb9ad678c686f4522c7b03d26c8c
Author: FrÃdÃric PÃters <fpeters 0d be>
Date:   Fri Jun 22 12:59:53 2012 +0200

    fix calling config.load() without parameter (fix buildbot server)

 jhbuild/config.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/jhbuild/config.py b/jhbuild/config.py
index 5b5b26b..bc402dd 100644
--- a/jhbuild/config.py
+++ b/jhbuild/config.py
@@ -243,7 +243,7 @@ class Config:
             traceback.print_exc()
             raise FatalError(_('Could not include config file (%s)') % filename)
 
-    def load(self, filename):
+    def load(self, filename=None):
         config = self._config
         if filename:
             try: