Fixes #3566 loading with '''ES6''' script loaders
Fixes #3566 loading with '''ES6''' script loaders

tzkKrbys/backbone,sunday-star/backbone,premkumargithub/backbone,neocotic/hipbone,howtolearntocode/backbone,chyeh727/backbone,youprofit/backbone,jmeas/backbone,wushuyi/backbone,Krasnyanskiy/backbone,jridgewell/backbone,Diwahars/backbone,zgl2007dj/backbone,Sachin-Ganesh/backbone,Sachin-Ganesh/backbone,ridixcr/backbone,ywenjinlin/backbone,pandoraui/backbone,ntgn81/backbone,guahanweb/backbone,Flip120/backbone,fanhc019/backbone,jewsroch/backbone,vin100bk/backbone,wangdahoo/backbone,7213/backbone,mrblueblue/backbone,FishbaitHarry/backbone,huanglp47/backbone,neocotic/hipbone,cgvarela/backbone,braddunbar/backbone,closeio/backbone,zdespolit/backbone,Niades/backbone,timebackzhou/backbone,moccen/backbone,jashkenas/backbone,huanglp47/backbone,zhangdimelody/backbone,GrimDerp/backbone,darrrk/backbone,paulfalgout/backbone,ThiagoGarciaAlves/backbone,zhoufan879/backbone,zhoufan879/backbone,cgvarela/backbone,liudianpeng/backbone,lastjune/backbone,zdespolit/backbone,jmeas/backbone,platinumazure/backbone,aihua/backbone,chyeh727/backbone,streamablevideo/backbone,vincent1988/backbone,dcheepurupalli/backbone,nikolas/backbone,dak/backbone,elancom/backbone,Niades/backbone,anhtholee/backbone,anhtholee/backbone,moimikey/backbone,ohbarye/backbone,fanhc019/backbone,zhangwei001/backbone,sunday-star/backbone,gougouGet/backbone,cailong1028/backbone,akre54/backbone,ppker/backbone,paulfalgout/backbone,getshuvo/backbone,dcheepurupalli/backbone,zgl2007dj/backbone,yuhualingfeng/backbone,au-phiware/backbone,Connectlegendary/backbone,closeio/backbone,nikolas/backbone,aihua/backbone,ntgn81/backbone,leimd/backbone,gougouGet/backbone,ridixcr/backbone,streamablevideo/backbone,getshuvo/backbone,craigmichaelmartin/backbone,jashkenas/backbone,alekskorolev/lightbones,braddunbar/backbone,ThiagoGarciaAlves/backbone,sueyeh/backbone,wangdahoo/backbone,zhangwei001/backbone,IsoldaJS/isolda-models,wjb12/backbone,feychenie/backbone,feychenie/backbone,udhayam/backbone,Krasnyanskiy/backbone,7213/backbone,mrblueblue/backbone,lujocom/backbone,wxmfront/backbone,ereddate/backbone,wushuyi/backbone,leimd/backbone,sumyfly/backbone,Diwahars/backbone,premkumargithub/backbone,rashmisajjan/backbone,platinumazure/backbone,jungjung917/backbone,Connectlegendary/backbone,sumyfly/backbone,sueyeh/backbone,zhangdimelody/backbone,sitexa/backbone,moimikey/backbone,howtolearntocode/backbone,trizko/backbone,wxmfront/backbone,embarknow/backbone,linalu1/backbone,youprofit/backbone,tadwhitaker/backbone,liudianpeng/backbone,sitexa/backbone,jewsroch/backbone,yuhualingfeng/backbone,vin100bk/backbone,elma-cao/backbone,Bug2014/backbone,heroazure/backbone,rashmisajjan/backbone,embarknow/backbone,gmaclennan/backbone,jridgewell/backbone,Flip120/backbone,yawenl/backbone,ereddate/backbone,Bug2014/backbone,tadwhitaker/backbone,wangcan2014/backbone,tzkKrbys/backbone,elma-cao/backbone,jungjung917/backbone,au-phiware/backbone,FishbaitHarry/backbone,tibic/backbone,akre54/backbone,wjb12/backbone,pandoraui/backbone,tibic/backbone,heroazure/backbone,ppker/backbone,trizko/backbone,gmaclennan/backbone,ohbarye/backbone,cailong1028/backbone,alekskorolev/lightbones,DannyDelott/backbone,DannyDelott/backbone,wangcan2014/backbone,darrrk/backbone,lujocom/backbone,IsoldaJS/isolda-pubsub,GrimDerp/backbone,udhayam/backbone,ywenjinlin/backbone,linalu1/backbone,dak/backbone,guahanweb/backbone,timebackzhou/backbone,craigmichaelmartin/backbone,moccen/backbone,elancom/backbone,lastjune/backbone,vincent1988/backbone,yawenl/backbone