notes: Don't create (empty) commit when removing non-existing notes
Extend remove_note() in the notes API to return whether or not a note was actually removed. Use this in 'git notes remove' to skip the creation of a notes commit when no notes were actually removed. Also add a test illustrating the change in behavior. Signed-off-by: NJohan Herland <johan@herland.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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