Fix error msg on missing config file

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/branches/fork@1654 b32b6428-25c9-4566-ad07-03861ab6144f

lib/xaal/lib/config.py

@@ -48,4 +48,3 @@ def load_config(name='xaal.ini'):
         self.key = None
 
 load_config()
-

lib/xaal/lib/tools.py

@@ -59,7 +59,7 @@ def load_cfg(app_name):
 def load_cfg_or_die(app_name):
     cfg = load_cfg(app_name)
     if not cfg:
-        print("Unable to load config file")
+        print("Unable to load config file %s" % get_cfg_filename(app_name))
         sys.exit(-1)
     return cfg