Exception: 'NoneType' object has no attribute 'getmaxyx'

[pJunger]

Hey,

I've encountered this exception after doing the following on the master branch (8bb67d6):

1. Open a file
2. Press Enter
3. Exiting via Ctrl + q

That lead to the following output:

Traceback (most recent call last):
  File "/usr/local/bin/suplemon", line 11, in <module>
    load_entry_point('Suplemon==0.2.1', 'console_scripts', 'suplemon')()
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/cli.py", line 37, in main
    app.run()
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 132, in run
    self.ui.run(self.run_wrapped)
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/ui.py", line 142, in run
    curses.wrapper(func)
  File "/usr/lib/python3.8/curses/__init__.py", line 105, in wrapper
    return func(stdscr, *args, **kwds)
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 148, in run_wrapped
    self.main_loop()
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 201, in main_loop
    self.on_input(event)  # PERF: Up to 30% processing time
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 173, in on_input
    if not self.handle_input(event):
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 301, in handle_input
    return self.handle_key(event)
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 322, in handle_key
    self.run_operation(operation)
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 506, in run_operation
    result = self.operations[operation]()
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/main.py", line 389, in ask_exit
    yes = self.ui.query_bool("Exit?")
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/ui.py", line 539, in query_bool
    result = self._query(text, default, PromptBool)
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/ui.py", line 525, in _query
    out = self.text_input.get_input(text, initial)
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/prompt.py", line 129, in get_input
    self.end()  # Move to the end of the initial text
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/viewer.py", line 738, in end
    self.move_cursors()
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/viewer.py", line 578, in move_cursors
    size = self.get_size()
  File "/usr/local/lib/python3.8/dist-packages/Suplemon-0.2.1-py3.8.egg/suplemon/viewer.py", line 104, in get_size
    y, x = self.window.getmaxyx()
AttributeError: 'NoneType' object has no attribute 'getmaxyx'