818824b3ba8a513c0c2a1934f060c017ff94a861
larrym
  Thu Aug 2 13:26:20 2012 -0700
handle edge case of user zeroing out the positionInput box
diff --git src/hg/hgTracks/hgTracks.c src/hg/hgTracks/hgTracks.c
index 2772a0f..7218def 100644