fix(eye): guard missing model instance#7180

wookieejedi merged 1 commit intoscp-fs2open:masterscp-fs2open/fs2open.github.com:masterfrom

danielchristiancazares:fix/object-get-eye-guarddanielchristiancazares/fs2open.github.com:fix/object-get-eye-guardCopy head branch name to clipboard