Cursor out of bounds

[olls]

There is an error when the cursor is not on the screen. This can be triggered by falling out of the world with the cursor pointed down.

[olls]

Traceback (most recent call last):
  File "main.py", line 273, in <module>
    main()
  File "main.py", line 18, in main
    game(blocks, *ui.main())
  File "main.py", line 109, in game
    x, y, cursor, map_, blocks, meta['inv'], inv_sel
  File "/home/olls/Downloads/repos/python/pycraft/player.py", line 127, in cursor_colour
    block = blocks[ map_[ x + cursor_x[cursor] ][ y + cursor_y[cursor] ] ]
IndexError: list index out of range