[lodash] add type guards to isNull, isUndefined, isNil
[lodash] add type guards to isNull, isUndefined, isNil

shlomiassaf/DefinitelyTyped,benliddicott/DefinitelyTyped,markogresak/DefinitelyTyped,progre/DefinitelyTyped,johan-gorter/DefinitelyTyped,zuzusik/DefinitelyTyped,georgemarshall/DefinitelyTyped,amir-arad/DefinitelyTyped,use-strict/DefinitelyTyped,scriby/DefinitelyTyped,arusakov/DefinitelyTyped,one-pieces/DefinitelyTyped,scriby/DefinitelyTyped,minodisk/DefinitelyTyped,chrismbarr/DefinitelyTyped,YousefED/DefinitelyTyped,aciccarello/DefinitelyTyped,abbasmhd/DefinitelyTyped,isman-usoh/DefinitelyTyped,alexdresko/DefinitelyTyped,jimthedev/DefinitelyTyped,AgentME/DefinitelyTyped,abbasmhd/DefinitelyTyped,YousefED/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,micurs/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,nycdotnet/DefinitelyTyped,AgentME/DefinitelyTyped,QuatroCode/DefinitelyTyped,dsebastien/DefinitelyTyped,psnider/DefinitelyTyped,use-strict/DefinitelyTyped,borisyankov/DefinitelyTyped,benishouga/DefinitelyTyped,magny/DefinitelyTyped,dsebastien/DefinitelyTyped,benishouga/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,johan-gorter/DefinitelyTyped,chrootsu/DefinitelyTyped,rolandzwaga/DefinitelyTyped,sledorze/DefinitelyTyped,mcrawshaw/DefinitelyTyped,sledorze/DefinitelyTyped,arusakov/DefinitelyTyped,ashwinr/DefinitelyTyped,aciccarello/DefinitelyTyped,jimthedev/DefinitelyTyped,aciccarello/DefinitelyTyped,psnider/DefinitelyTyped,alvarorahul/DefinitelyTyped,AgentME/DefinitelyTyped,psnider/DefinitelyTyped,progre/DefinitelyTyped,nycdotnet/DefinitelyTyped,isman-usoh/DefinitelyTyped,rolandzwaga/DefinitelyTyped,zuzusik/DefinitelyTyped,mcliment/DefinitelyTyped,shlomiassaf/DefinitelyTyped,benishouga/DefinitelyTyped,mcrawshaw/DefinitelyTyped,georgemarshall/DefinitelyTyped,chrismbarr/DefinitelyTyped,smrq/DefinitelyTyped,arusakov/DefinitelyTyped,georgemarshall/DefinitelyTyped,magny/DefinitelyTyped,jimthedev/DefinitelyTyped,ashwinr/DefinitelyTyped,alexdresko/DefinitelyTyped,georgemarshall/DefinitelyTyped,chrootsu/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,AgentME/DefinitelyTyped,borisyankov/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,minodisk/DefinitelyTyped,QuatroCode/DefinitelyTyped,alvarorahul/DefinitelyTyped,smrq/DefinitelyTyped,zuzusik/DefinitelyTyped