fix following frequently bluescreen

fix following frequently bluescreen

  File "/enigma2-1.0-r0/enigma2/lib/python/Screens/InfoBarGenerics.py", line
1917, in __tuneFailed
    Notifications.AddPopup(text = error, type = MessageBox.TYPE_ERROR,
timeout = 5, id = "ZapError")
  File "/enigma2-1.0-r0/enigma2/lib/python/Tools/Notifications.py", line 45,
in AddPopup
    AddNotificationWithID(id, MessageBox, text = text, type = type, timeout
= timeout, close_on_any_key = True)
....
....
....
TypeError: in method 'eLabel_setText', argument 2 of type 'std::string
const &'