[dvd::rip] Problem with single audio track projects in a cluster

I've discovered that in 0.98.9, if you have a project with a single audio track in a cluster, there are no guarantees that the full audio track will be merged in with the final video.

This is due to the fact that in this situation, the merge-video-chunks job doesn't depend on the audio-track-processing job, so when it performs the merge, it is possible that the audio track hasn't been fully processed (or even processed at all), and thus causes issues with the final output video.

The attached patch should resolve the issue.

--
Matt Lawrence, President                    m3lawren at uwaterloo dot ca
Computer Science Club               http://csclub.uwaterloo.ca/~m3lawren
Mathematics Society                        MC 3036, (519)888-4567,x33870
University of Waterloo                  Waterloo, Ontario CANADA N2L 3G1

Index: lib/Video/DVDRip/Cluster/JobPlanner.pm
===================================================================
RCS file: /cvs/dvdrip/lib/Video/DVDRip/Cluster/JobPlanner.pm,v
retrieving revision 1.3
diff -a -u -r1.3 JobPlanner.pm
--- lib/Video/DVDRip/Cluster/JobPlanner.pm      16 Aug 2006 19:34:38 -0000      
1.3
+++ lib/Video/DVDRip/Cluster/JobPlanner.pm      23 Nov 2008 05:48:27 -0000
@@ -132,6 +132,8 @@
         if ( $tc_merge_audio_job ) {
             $tc_merge_audio_job->set_depends_on([$tc_merge_video_job, 
$tc_audio_job]);
             push @psu_jobs, $tc_merge_audio_job;
+        } elsif ($tc_audio_job) {
+            $tc_merge_video_job->set_depends_on([$tc_audio_job])
         }
     }