Avoid Function#call unless context is provided.
Avoid Function#call unless context is provided.

Fix #1554.

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