[Test] Add a regression test for invalid/empty file literals.
[Test] Add a regression test for invalid/empty file literals.

karwa/swift,gregomni/swift,aschwaighofer/swift,glessard/swift,xwu/swift,CodaFi/swift,CodaFi/swift,xwu/swift,parkera/swift,stephentyrone/swift,benlangmuir/swift,CodaFi/swift,harlanhaskins/swift,apple/swift,airspeedswift/swift,rudkx/swift,aschwaighofer/swift,parkera/swift,lorentey/swift,hooman/swift,harlanhaskins/swift,glessard/swift,xwu/swift,nathawes/swift,nathawes/swift,jckarter/swift,parkera/swift,JGiola/swift,CodaFi/swift,benlangmuir/swift,nathawes/swift,jmgc/swift,lorentey/swift,tkremenek/swift,karwa/swift,stephentyrone/swift,atrick/swift,nathawes/swift,apple/swift,jmgc/swift,xwu/swift,jckarter/swift,rudkx/swift,jmgc/swift,airspeedswift/swift,ahoppen/swift,benlangmuir/swift,hooman/swift,karwa/swift,karwa/swift,aschwaighofer/swift,apple/swift,parkera/swift,karwa/swift,hooman/swift,parkera/swift,karwa/swift,rudkx/swift,stephentyrone/swift,roambotics/swift,stephentyrone/swift,airspeedswift/swift,allevato/swift,glessard/swift,gribozavr/swift,xwu/swift,glessard/swift,aschwaighofer/swift,nathawes/swift,JGiola/swift,CodaFi/swift,lorentey/swift,airspeedswift/swift,xwu/swift,apple/swift,ahoppen/swift,hooman/swift,harlanhaskins/swift,gregomni/swift,aschwaighofer/swift,atrick/swift,roambotics/swift,rudkx/swift,atrick/swift,ahoppen/swift,JGiola/swift,benlangmuir/swift,allevato/swift,tkremenek/swift,hooman/swift,jckarter/swift,karwa/swift,JGiola/swift,hooman/swift,aschwaighofer/swift,roambotics/swift,roambotics/swift,jmgc/swift,airspeedswift/swift,gribozavr/swift,nathawes/swift,xwu/swift,gregomni/swift,tkremenek/swift,tkremenek/swift,gribozavr/swift,benlangmuir/swift,ahoppen/swift,jckarter/swift,allevato/swift,ahoppen/swift,allevato/swift,gregomni/swift,rudkx/swift,harlanhaskins/swift,JGiola/swift,harlanhaskins/swift,airspeedswift/swift,parkera/swift,glessard/swift,gribozavr/swift,tkremenek/swift,glessard/swift,atrick/swift,atrick/swift,gregomni/swift,benlangmuir/swift,lorentey/swift,parkera/swift,rudkx/swift,jckarter/swift,jmgc/swift,CodaFi/swift,apple/swift,roambotics/swift,allevato/swift,apple/swift,jmgc/swift,jmgc/swift,harlanhaskins/swift,stephentyrone/swift,tkremenek/swift,lorentey/swift,jckarter/swift,parkera/swift,tkremenek/swift,allevato/swift,gribozavr/swift,lorentey/swift,ahoppen/swift,gregomni/swift,aschwaighofer/swift,CodaFi/swift,atrick/swift,jckarter/swift,gribozavr/swift,nathawes/swift,airspeedswift/swift,stephentyrone/swift,harlanhaskins/swift,lorentey/swift,lorentey/swift,karwa/swift,stephentyrone/swift,JGiola/swift,allevato/swift,gribozavr/swift,hooman/swift,roambotics/swift,gribozavr/swift