TypeError: iterable argument required

    Traceback (most recent call last):
      File "/home/nk/gajim/src/conversation_textview.py", line 421, in on_textview_button_press_event
        if 'url' in tag_name or 'mail' in tag_name:
    TypeError: iterable argument required
    Traceback (most recent call last):
      File "/home/nk/gajim/src/conversation_textview.py", line 421, in on_textview_button_press_event
        if 'url' in tag_name or 'mail' in tag_name:
    TypeError: iterable argument required