'NoneType' object has no attribute 'spatial_object' on Expense Analysis results

[HarryTSaban]

amazon-textract-textractor/textractor/entities/expense_field.py

Lines 184 to 189 in 9df5d26

	def bbox(self):
	# Dangerous, we need at least one expense in an expense row
	return BoundingBox.enclosing_bbox(
	[f.bbox for f in self._line_item_expense_fields],
	spatial_object=self.expenses[0].bbox.spatial_object,
	)

The above code throws an AttributeError when the bbox on self.expenses[0] is None. Since spatial_object can be None, would it make sense to add some protection here?