`Zone.coords` annotation should be marked `Optional`

[BryceBeagle]

brainframe-python/brainframe/api/bf_codecs/zone_codecs.py

Lines 23 to 29 in b780503

	coords: List[List[int]]
	"""Coordinates that define the region the zone occupies. It is a list
	of lists which are two elements in size. The coordinates are in pixels
	where the top left of the frame is [0, 0].
	Example: [[0, 0], [10, 10], [100, 500], [0, 500]]
	"""

Zone.coords=None for the "Screen"/Zone.FULL_FRAME_ZONE_NAME region.