In interestcube, closed the open cube to prevent errors from running...

In interestcube, closed the open cube to prevent errors from running sequential data in GUI. Fixes #1002.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@5925 41f8697f-d340-4b68-9986-7bafba869bb8