Improve error message raised by str2bbox function

[vincentsarago]

stac-fastapi/stac_fastapi/types/stac_fastapi/types/search.py

Lines 34 to 41 in 417ea2c

	def str2bbox(x: str) -> Optional[BBox]:
	"""Convert string to BBox based on , delimiter."""
	if x:
	t = tuple(float(v) for v in x.split(","))
	assert len(t) in [4, 6], f"BBox '{x}' must have 4 or 6 values."
	return t
	return None

ref stac-utils/stac-fastapi-geoparquet#10