Fix bug when network is empty , caused seg fault when attempting to draw measures in chip.
git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3788 41f8697f-d340-4b68-9986-7bafba869bb8
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git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3788 41f8697f-d340-4b68-9986-7bafba869bb8