Client segfault if server stopped

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Segfault if using mocp --format '%t' (or any other non empty format string, for that matter) against a server instance that is running but not playing a song.

I've added comments here: http://paste.posativ.org/i1u The second comment is not really related to the issue, just a remark.

Fix committed to SVN as r2531: Fix segfault when using '--format' without an audio playing.