Showing features of a Surface layer causes problems

[Cryaaa]

When I use the show table widget on a surface layer which has the feature attribute set but not the properties attribute then the table widget sets the properties to an empty dictionary. This causes 2 issues:

1. The features of the surface layer are not shown
2. Other plugins trying to access the features see empty properties although the feature attribute is populated

I believe these lines are the culprit, so maybe we could change the checks to include both the properties and the features attribute? I will make a quick fork and pull request soon

napari-skimage-regionprops/napari_skimage_regionprops/_table.py

Lines 32 to 35 in e38cc72

	if hasattr(layer, "properties"):
	self.set_content(layer.properties)
	else:
	self.set_content({})