fixing null reference in yarn.lock check (#3444)
fixing null reference in yarn.lock check (#3444)


MahmoudFayed/linguist,tschf/linguist,yyx990803/linguist,sebgod/linguist,erkyrath/linguist,github/linguist,stanhu/linguist,yyx990803/linguist,github/linguist,christop/linguist,JJ/linguist,stanhu/linguist,sebgod/linguist,christop/linguist,pchaigno/linguist,pchaigno/linguist,pchaigno/linguist,sebgod/linguist,yyx990803/linguist,JJ/linguist,erkyrath/linguist,pchaigno/linguist,tschf/linguist,JJ/linguist,sebgod/linguist,yyx990803/linguist,github/linguist,github/linguist,R4PaSs/linguist,MahmoudFayed/linguist,mwpastore/linguist,erkyrath/linguist,stanhu/linguist,JJ/linguist,stanhu/linguist,erkyrath/linguist,mwpastore/linguist,R4PaSs/linguist