fix: Remove TypeError in favor of pass through for unit tests

[mgwozdz-unicon]

To address

FAILED cms/djangoapps/contentstore/views/tests/test_clipboard_paste.py::ClipboardPasteTestCase::test_copy_and_paste_unit_with_tags - TypeError: Expected origin to be Tag, QuerySet[Tag], or None; got Taxonomy

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[kdmccormick]

I think we need to actually handle this case rather than just patch it in tests, since it's possible to delete a Taxonomy from the platform.

Could you review #575 and/or #577 ?

Looking at alternate suggestion.

[kdmccormick]

Ah, I see, I think this is actually the right fix if we don't want to emit any events when a Taxonomy is deleted. #575 is only the right fix if we do want events from the top-level tags when a Taxonomy is deleted.

This PR fine by me, but I'll defer to @ormsbee to approve if this is the right behavior. My only request is that we update the comment to clarify that a Taxonomy CASCADE can happen in real code, not just unit tests.

Thanks!

[kdmccormick]

Suggested change

	# This is needed to prevent unit test failures where this is called when origin
	# is not a Tag or QuerySet.
	# In the event of a CASCADE deletion (e.g. from Taxonomy), emit no events.

see comment

[kdmccormick]

Closed in favor of #575