Fixed null check errors (#15082)
Fixed null check errors (#15082)


johan-gorter/DefinitelyTyped,arusakov/DefinitelyTyped,isman-usoh/DefinitelyTyped,QuatroCode/DefinitelyTyped,zuzusik/DefinitelyTyped,aciccarello/DefinitelyTyped,mcrawshaw/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,AgentME/DefinitelyTyped,YousefED/DefinitelyTyped,georgemarshall/DefinitelyTyped,YousefED/DefinitelyTyped,benishouga/DefinitelyTyped,johan-gorter/DefinitelyTyped,QuatroCode/DefinitelyTyped,markogresak/DefinitelyTyped,borisyankov/DefinitelyTyped,rolandzwaga/DefinitelyTyped,mcliment/DefinitelyTyped,nycdotnet/DefinitelyTyped,jimthedev/DefinitelyTyped,magny/DefinitelyTyped,smrq/DefinitelyTyped,AgentME/DefinitelyTyped,borisyankov/DefinitelyTyped,georgemarshall/DefinitelyTyped,arusakov/DefinitelyTyped,arusakov/DefinitelyTyped,nycdotnet/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,amir-arad/DefinitelyTyped,alexdresko/DefinitelyTyped,AgentME/DefinitelyTyped,dsebastien/DefinitelyTyped,isman-usoh/DefinitelyTyped,georgemarshall/DefinitelyTyped,smrq/DefinitelyTyped,mcrawshaw/DefinitelyTyped,zuzusik/DefinitelyTyped,chrootsu/DefinitelyTyped,georgemarshall/DefinitelyTyped,AgentME/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,zuzusik/DefinitelyTyped,ashwinr/DefinitelyTyped,dsebastien/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,alexdresko/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,ashwinr/DefinitelyTyped,aciccarello/DefinitelyTyped,benliddicott/DefinitelyTyped,one-pieces/DefinitelyTyped,minodisk/DefinitelyTyped,jimthedev/DefinitelyTyped,abbasmhd/DefinitelyTyped,chrootsu/DefinitelyTyped,aciccarello/DefinitelyTyped,benishouga/DefinitelyTyped,jimthedev/DefinitelyTyped,abbasmhd/DefinitelyTyped,minodisk/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,magny/DefinitelyTyped,benishouga/DefinitelyTyped,rolandzwaga/DefinitelyTyped