When picking a "high utility centroid" do not pick one  that has no corresponding points. Not only it is the  worst possible pick, but also the code was written  without this case in mind.
When picking a "high utility centroid" do not pick one 
that has no corresponding points. Not only it is the 
worst possible pick, but also the code was written 
without this case in mind.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@14341 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg