fix potential nil pointer
fix potential nil pointer

enj/kubernetes,shyamjvs/kubernetes,ping035627/kubernetes,kevin-wangzefeng/kubernetes,aledbf/kubernetes,jingxu97/kubernetes,jessfraz/kubernetes,ii/kubernetes,ii/kubernetes,mikebrow/kubernetes,carlory/kubernetes,mahak/kubernetes,dlorenc/kubernetes,micahhausler/kubernetes,k82/kubernetes,shyamjvs/kubernetes,fanzhangio/kubernetes,dlorenc/kubernetes,zhouhaibing089/kubernetes,x13n/kubernetes,mahak/kubernetes,carlory/kubernetes,MikeSpreitzer/kubernetes,nak3/kubernetes,x13n/kubernetes,csrwng/kubernetes,ingvagabund/kubernetes,rafax/kubernetes,GulajavaMinistudio/kubernetes,mosoft521/kubernetes,krmayankk/kubernetes,k82cn/kubernetes,zhouhaibing089/kubernetes,liggitt/kubernetes,Acidburn0zzz/kubernetes,dereknex/kubernetes,fabriziopandini/kubernetes,rrati/kubernetes,matthyx/kubernetes,nckturner/kubernetes,hex108/kubernetes,jsafrane/kubernetes,cblecker/kubernetes,x13n/kubernetes,ingvagabund/kubernetes,jsafrane/kubernetes,tengqm/kubernetes,cofyc/kubernetes,cblecker/kubernetes,enj/kubernetes,jingxu97/kubernetes,bparees/kubernetes,linux-on-ibm-z/kubernetes,weiwei04/kubernetes,kevin-wangzefeng/kubernetes,krmayankk/kubernetes,enj/kubernetes,iterion/kubernetes,feiskyer/kubernetes,monopole/kubernetes,jingxu97/kubernetes,dixudx/kubernetes,rnaveiras/kubernetes,tengqm/kubernetes,csrwng/kubernetes,shyamjvs/kubernetes,PiotrProkop/kubernetes,verult/kubernetes,deads2k/kubernetes,jessfraz/kubernetes,mkumatag/kubernetes,cblecker/kubernetes,monopole/kubernetes,hex108/kubernetes,tengqm/kubernetes,openshift/kubernetes,iameli/kubernetes,gnufied/kubernetes,carlory/kubernetes,MikeSpreitzer/kubernetes,feiskyer/kubernetes,liggitt/kubernetes,dereknex/kubernetes,weiwei04/kubernetes,alejandroEsc/kubernetes,mikebrow/kubernetes,kubernetes/kubernetes,weiwei04/kubernetes,lojies/kubernetes,hex108/kubernetes,mkumatag/kubernetes,cofyc/kubernetes,cblecker/kubernetes,jackfrancis/kubernetes,rnaveiras/kubernetes,Acidburn0zzz/kubernetes,alejandroEsc/kubernetes,rafax/kubernetes,PI-Victor/kubernetes,weiwei04/kubernetes,ravilr/kubernetes,MikeSpreitzer/kubernetes,micahhausler/kubernetes,jingxu97/kubernetes,csrwng/kubernetes,csrwng/kubernetes,tpepper/kubernetes,linux-on-ibm-z/kubernetes,dlorenc/kubernetes,dereknex/kubernetes,roberthbailey/kubernetes,nak3/kubernetes,BenTheElder/kubernetes,iterion/kubernetes,krmayankk/kubernetes,ingvagabund/kubernetes,deads2k/kubernetes,micahhausler/kubernetes,thockin/kubernetes,carlory/kubernetes,kevin-wangzefeng/kubernetes,mikedanese/kubernetes,ping035627/kubernetes,dlorenc/kubernetes,nak3/kubernetes,x13n/kubernetes,chestack/kubernetes,idvoretskyi/kubernetes,k82/kubernetes,iameli/kubernetes,sdminonne/kubernetes,spzala/kubernetes,roberthbailey/kubernetes,zhangmingld/kubernetes,hex108/kubernetes,enj/kubernetes,verult/kubernetes,tpepper/kubernetes,ii/kubernetes,fabriziopandini/kubernetes,ingvagabund/kubernetes,warmchang/kubernetes,BenTheElder/kubernetes,gnufied/kubernetes,mosoft521/kubernetes,Acidburn0zzz/kubernetes,mengqiy/kubernetes,PI-Victor/kubernetes,tpepper/kubernetes,Clarifai/kubernetes,humblec/kubernetes,zhangmingld/kubernetes,micahhausler/kubernetes,soltysh/kubernetes,liggitt/kubernetes,Clarifai/kubernetes,mengqiy/kubernetes,x13n/kubernetes,micahhausler/kubernetes,dlorenc/kubernetes,warmchang/kubernetes,BenTheElder/kubernetes,openshift/kubernetes,x13n/kubernetes,fanzhangio/kubernetes,Clarifai/kubernetes,deads2k/kubernetes,aledbf/kubernetes,Clarifai/kubernetes,openshift/kubernetes,wongma7/kubernetes,wongma7/kubernetes,Clarifai/kubernetes,ravilr/kubernetes,lojies/kubernetes,verult/kubernetes,idvoretskyi/kubernetes,Clarifai/kubernetes,saad-ali/kubernetes,soltysh/kubernetes,Acidburn0zzz/kubernetes,PI-Victor/kubernetes,tengqm/kubernetes,spzala/kubernetes,verb/kubernetes,ii/kubernetes,csrwng/kubernetes,li-ang/kubernetes,mengqiy/kubernetes,feiskyer/kubernetes,liggitt/kubernetes,linux-on-ibm-z/kubernetes,monopole/kubernetes,idvoretskyi/kubernetes,BenTheElder/kubernetes,rrati/kubernetes,warmchang/kubernetes,PiotrProkop/kubernetes,ingvagabund/kubernetes,ravilr/kubernetes,k82cn/kubernetes,fanzhangio/kubernetes,dereknex/kubernetes,thockin/kubernetes,GulajavaMinistudio/kubernetes,kubernetes/kubernetes,cofyc/kubernetes,k82/kubernetes,saad-ali/kubernetes,mikedanese/kubernetes,krmayankk/kubernetes,matthyx/kubernetes,PiotrProkop/kubernetes,iterion/kubernetes,rafax/kubernetes,roberthbailey/kubernetes,nikhita/kubernetes,zhangmingld/kubernetes,mosoft521/kubernetes,MikeSpreitzer/kubernetes,gnufied/kubernetes,idvoretskyi/kubernetes,andrewrynhard/kubernetes,thockin/kubernetes,iterion/kubernetes,jagosan/kubernetes,mahak/kubernetes,sdminonne/kubernetes,rrati/kubernetes,chrislovecnm/kubernetes,bparees/kubernetes,krmayankk/kubernetes,PiotrProkop/kubernetes,krmayankk/kubernetes,saad-ali/kubernetes,rnaveiras/kubernetes,aledbf/kubernetes,jessfraz/kubernetes,jackfrancis/kubernetes,dims/kubernetes,matthyx/kubernetes,PI-Victor/kubernetes,soltysh/kubernetes,andrewrynhard/kubernetes,fabriziopandini/kubernetes,aledbf/kubernetes,zhangmingld/kubernetes,li-ang/kuber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