Handle cases explicitly for `KeyError` or `ValueError` in `_make_tiles`

[selmanozleyen]

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Handle cases explicitly for KeyError or ValueError in _make_tiles. For example in

squidpy/src/squidpy/experimental/im/_make_tiles.py

Lines 840 to 851 in d4f256f

	def _get_primary_coordinate_system(element: SpatialElement) -> str | None:
	"""Return the first available coordinate system, preferring 'global'."""
	try:
	transformations = get_transformation(element, get_all=True)
	except (KeyError, ValueError):
	return None
	if not transformations:
	return None
	# Prefer 'global' if present
	if "global" in transformations:
	return "global"
	return next(iter(transformations.keys()))

Seperating this issue to speed up development