wp post term remove reports success when the term is not assigned #691

wp post term remove prints Success even when nothing was removed:

$ wp post term add 1 post_tag apple
$ wp term create post_tag banana
$ wp post term remove 1 post_tag banana
Success: Removed term.

banana was never assigned to post 1. wp_remove_object_terms() returns false when no relationship was deleted, and WP_Error only for an invalid taxonomy or term lookup error. CommandWithTerms::remove() checks only is_wp_error(), so false falls through to the success message. wp user term remove uses the same class.

Expected: an error with a non-zero exit code, the same as wp post meta delete on a key that is not set (Error: Failed to delete custom field.).