'/taxonomies' response for edit/ embed context returns inconsistent response for unprivileged access #1185

#702 (comment)

Additionally, right now setting context either succeeds (returns all data for that context) or fails (returns no data/an error), which is kind of nice in that you immediately know if you can't access the data. Returning a subset of data if you don't have full permissions means you can't necessarily be sure if there's more data to access.

It should either return no data or error for consistency.