Fixed uninitialized array element in apinit that was causing its app test to...

Fixed uninitialized array element in apinit that was causing its app test to fail on CentOS7. References #4809.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/Fedora25@8126 41f8697f-d340-4b68-9986-7bafba869bb8