From Andrei:

I had introduced an unitialized variable with my previous patch. I attached the
fix.
In attachment there is also a fix for unions having a common exit boundary - infinite
loop in TGeoUnion::DistToOutside().


git-svn-id: http://root.cern.ch/svn/root/trunk@13918 27541ba8-7e3a-0410-8455-c3a389f83636