Fix for when prompt is null (submitted by Bernard Sufrin)
Fix for when prompt is null (submitted by Bernard Sufrin)

msaxena2/jline2,mikebrock/jline,DALDEI/jline2,mikiobraun/jline-fork,mikebrock/jline,mikiobraun/jline-fork,gnodet/test,pcl/jline,hns/jline,scala/scala-jline,gnodet/jline,tkruse/jline2,renew-tgi/jline2,pcl/jline,kaulkie/jline2,fantasy86/jline2,gnodet/jline,scala/scala-jline,cosmin/jline2,hns/jline,mikiobraun/jline-fork,ctubbsii/jline2