Add null check when header is empty.
Add null check when header is empty.

Ariel-Isaacm/spark,stylismo/spark,rokusr/spark,alexlondon07/spark,micsta/spark,micsta/spark,perwendel/spark,hendrosteven/spark,stylismo/spark,perwendel/spark,martylamb/spark,marstianna/spark,ztx1491/spark,xdcrafts/spark,guilhermehbueno/spark,rokusr/spark,MouettE-SC/spark,universsky/spark-1,martylamb/spark,seetharamireddy540/spark,stylismo/spark,gimlet2/spark,hendrosteven/spark,rokusr/spark,mugizico/spark,mugizico/spark,MouettE-SC/spark,arekkw/spark,Tradunsky/spark,jacek99/spark,tempbottle/spark-1,gimlet2/spark,jabgibson/spark,Ariel-Isaacm/spark,arekkw/spark,jabgibson/spark,MouettE-SC/spark,opsonsy/spark,micsta/spark,northcapen/spark,zeroflag/spark,universsky/spark-1,gutobortolozzo/spark,Tradunsky/spark,gimlet2/spark,jacek99/spark,ztx1491/spark,perwendel/spark,PYangDizzle/Spark,northcapen/spark,PYangDizzle/Spark,tempbottle/spark-1,guilhermehbueno/spark,seetharamireddy540/spark,opsonsy/spark,stylismo/spark,alexlondon07/spark,xdcrafts/spark,zeroflag/spark,gimlet2/spark,gutobortolozzo/spark,marstianna/spark