Managers, taggable: make anon set_tags fail silently #516
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When a manager attempts to set tags on an item with an anonymous user, the taggable manager would previously error.
If we attempt to copy tags when we copy hdas however, and the user doing the copying is anonymous: the copy should be doable but there is no user to associate with the tags (we can't use the original's user's tags).
An unsatisfying compromise is to fail silently when an anon user copies hdas. The hda will not have the original tags but the copy will be possible.