Adds a test case when we call _.pluck() to objects passing an undefined property as an argument.
Adds a test case when we call _.pluck() to objects passing an undefined property as an argument.

wjb12/underscore,craigmichaelmartin/underscore,JoaquinSiabra/underscore,AaronNGray/underscore-server,vinodbonala/underscore,akre54/underscore,cnwhy/underscore,jridgewell/underscore,irr/underscore,mitar/underscore,ereddate/underscore,Tim-Zhang/underscore,yuhualingfeng/underscore,ThiagoGarciaAlves/underscore,Feiyang1/underscore,dxuehu/underscore,singhsterabhi/underscore,platinumazure/underscore,thisismygithub/underscore,PUSEN/underscore,colemakdvorak/underscore,lucasfanning/underscore,zabefloyd/underscore,ijidan/underscore,kuychaco/underscore,JonAbrams/underscore,thisismygithub/underscore,cgvarela/underscore,dxuehu/underscore,huangnan1/2016gitStudy,ereddate/underscore,wjb12/underscore,natac13/underscore,Yangani/underscore,kairyan/underscore,PengShi-sp/underscore,mairasala/underscore,kuychaco/underscore,janocat/underscore,documentcloud/underscore,mdboop/underscore,keepgoingwm/underscore,jpalomar/underscore,natac13/underscore,kwangkim/underscore,kairyan/underscore,tnga/underscore-es,mjhasbach/underscore,wxmfront/underscore,vinodbonala/underscore,ryanwholey/underscore,kwangkim/underscore,vincent1988/underscore,elancom/underscore,nickkneafsey/underscore,cintiamh/underscore,xiaoqiang730730/underscore,premkumargithub/underscore,nickkneafsey/underscore,platinumazure/underscore,huangnan1/2016gitStudy,colemakdvorak/underscore,elancom/underscore,jonot/underscore,megawac/underscore,Joanna913/underscore,wxmfront/underscore,jordanwink201/underscore,WangRex/underscore,Gimcrack/underscore,documentcloud/underscore,yekg880809/underscore,falqas/underscore,SeriaWei/underscore,lis186/underscore,ElseZhang/underscore,Forever8/underscore,aziz-boudi4/underscore,xiaoqiang730730/underscore,huzion/underscore,SerenoShen/underscore,jashkenas/underscore,yuhualingfeng/underscore,jolthoff/underscore,strongconjunctions/underscore,jianganglu/underscore,huzion/underscore,dfurtado/underscore,yekg880809/underscore,irr/underscore,mairasala/underscore,liminghui/underscore,prosenjit-itobuz/underscore,dkusch/underscore,jianganglu/underscore,JonAbrams/underscore,JoaquinSiabra/underscore,oss6/underscore,cnwhy/underscore,ligson/underscore,snackshen/underscore,debutt/underscore,RepmujNetsik/underscore,ryanwholey/underscore,RepmujNetsik/underscore,greyhwndz/underscore,roychen-7/underscore,imsingh/underscore,emiel187/underscore,polandeme/underscore,liyandalmllml/underscore,strongconjunctions/underscore,jordanwink201/underscore,thiswildorchid/underscore,snackshen/underscore,zhangguangyong/underscore,dyx/underscore,veg/underscore,lis186/underscore,ligson/underscore,gougouGet/underscore,jpalomar/underscore,prosenjit-itobuz/underscore,rlugojr/underscore,SeriaWei/underscore,imsingh/underscore,cintiamh/underscore,sdwang/underscore,sdwang/underscore,dyx/underscore,oss6/underscore,lqjack/underscore,jiankers/underscore,veg/underscore,AaronNGray/underscore-server,aziz-boudi4/underscore,premkumargithub/underscore,craigmichaelmartin/underscore,youprofit/underscore,jdelbello/underscore,thiswildorchid/underscore,dkusch/underscore,PUSEN/underscore,beenlee/underscore,falqas/underscore,janocat/underscore,vincent1988/underscore,PengShi-sp/underscore,lucasfanning/underscore,Forever8/underscore,greyhwndz/underscore,emiel187/underscore,beenlee/underscore,gougouGet/underscore,tnga/underscore-es,jashkenas/underscore,jdelbello/underscore,roychen-7/underscore,jridgewell/underscore,jfarid27/underscore,Gimcrack/underscore,mdboop/underscore,singhsterabhi/underscore,cailong1028/underscore,eaglesjava/underscore,zhangguangyong/underscore,ijidan/underscore,eaglesjava/underscore,akre54/underscore,mjhasbach/underscore,bkillenit/underscore,SerenoShen/underscore,liminghui/underscore,mitar/underscore,cgvarela/underscore,Joanna913/underscore,ElseZhang/underscore,rlugojr/underscore,debutt/underscore,lqjack/underscore,keepgoingwm/underscore,jiankers/underscore,Feiyang1/underscore,jonot/underscore,bkillenit/underscore,jolthoff/underscore,zabefloyd/underscore,liyandalmllml/underscore,Yangani/underscore,jfarid27/underscore,polandeme/underscore,WangRex/underscore,dfurtado/underscore,ThiagoGarciaAlves/underscore,Tim-Zhang/underscore,youprofit/underscore