Pull another patch from Red Hat, to fix a runtime crash:

PANIC: unprotected error in call to Lua API (attempt to index a nil value)

PR: 195240
Red Hat bug: https://bugzilla.redhat.com/show_bug.cgi?id=1045632
Patch by: Chris Rankin (Comments 13-16)
Obtained from: celestia-1.6.1-15.fc20.src.rpm