fix ack error when attempt to save a playlist that already exists
git-svn-id: https://svn.musicpd.org/mpd/trunk@1402 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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git-svn-id: https://svn.musicpd.org/mpd/trunk@1402 09075e82-0dd4-0310-85a5-a0d7c8717e4f