bridge: DBusException also transports the twisted failure condition

frontends/src/bridge/bridge_frontend.py

@@ -29,15 +29,17 @@ class BridgeFrontend(object):
 class BridgeException(Exception):
     """An exception which has been raised from the backend and arrived to the frontend."""
 
-    def __init__(self, name, message):
+    def __init__(self, name, message='', condition=''):
         """
 
         @param name (str): full exception class name (with module)
         @param message (str): error message
+        @param condition (str) : error condition
         """
         Exception.__init__(self)
         self.fullname = unicode(name)
         self.message = unicode(message)
+        self.condition = unicode(condition) if condition else ''
         self.module, dummy, self.classname = unicode(self.fullname).rpartition('.')
 
     def __str__(self):