ENH: Allow BRAINSTransformConvert without output transform file

$ git shortlog 68303b3..4fb59c3
Kent Williams (1):
      COMP: Allow BRAINSTransformConvert without output transform file

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23637 3bd1e089-480b-0410-8dfb-8563597acbee