display.py: KeyError: 'ge_add_event_data'

[nbedos]

Hey guys, thanks for writing Xlib, it's been pretty useful to me recently :)

@kaushalmodi reported the following crash (original issue: nbedos/termtosvg#5). Is the caller of Xlib.display.Display expected to catch AttributeError, or is there something else going on here?

Thanks

km²~/.local/:bin> termtosvg                                                                                                                   06/28 1:18pm
Recording started, enter "exit" command or Control-D to end
Traceback (most recent call last):
  File "/home/kmodi/.local/lib/python3.7/site-packages/Xlib/display.py", line 224, in __getattr__
    function = self.display_extension_methods[attr]
KeyError: 'ge_add_event_data'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/kmodi/.local/bin/termtosvg", line 11, in <module>
    sys.exit(main())
  File "/home/kmodi/.local/lib/python3.7/site-packages/termtosvg/__main__.py", line 172, in main
    columns, lines, system_theme = term.get_configuration(output_fileno)
  File "/home/kmodi/.local/lib/python3.7/site-packages/termtosvg/term.py", line 340, in get_configuration
    xresources_str = _get_xresources()
  File "/home/kmodi/.local/lib/python3.7/site-packages/termtosvg/term.py", line 361, in _get_xresources
    d = display.Display()
  File "/home/kmodi/.local/lib/python3.7/site-packages/Xlib/display.py", line 127, in __init__
    mod.init(self, info)
  File "/home/kmodi/.local/lib/python3.7/site-packages/Xlib/ext/xinput.py", line 652, in init
    disp.ge_add_event_data(info.major_opcode, device_event, DeviceEventData)
  File "/home/kmodi/.local/lib/python3.7/site-packages/Xlib/display.py", line 227, in __getattr__
    raise AttributeError(attr)
AttributeError: ge_add_event_data