Fix an issue with MR unavailable if remove source branch
Fix an issue with MR unavailable if remove source branch

pjknkda/gitlabhq,ibiart/gitlabhq,ttasanen/gitlabhq,delkyd/gitlabhq,openwide-java/gitlabhq,TheWatcher/gitlabhq,gopeter/gitlabhq,wangcan2014/gitlabhq,icedwater/gitlabhq,it33/gitlabhq,nguyen-tien-mulodo/gitlabhq,szechyjs/gitlabhq,mente/gitlabhq,t-zuehlsdorff/gitlabhq,ikappas/gitlabhq,cinderblock/gitlabhq,stellamiranda/mobbr-gitlabhq,kemenaran/gitlabhq,SkyWei/gitlabhq,duduribeiro/gitlabhq,larryli/gitlabhq,yonglehou/gitlabhq,SVArago/gitlabhq,yuyue2013/ss,lvfeng1130/gitlabhq,cui-liqiang/gitlab-ce,adaiguoguo/gitlab_globalserarch,stoplightio/gitlabhq,vjustov/gitlabhq,dplarson/gitlabhq,bigsurge/gitlabhq,sideci-sample/sideci-sample-gitlabhq,rumpelsepp/gitlabhq,delkyd/gitlabhq,NKMR6194/gitlabhq,allistera/gitlabhq,sakishum/gitlabhq,salipro4ever/gitlabhq,NARKOZ/gitlabhq,liyakun/gitlabhq,LytayTOUCH/gitlabhq,ArthurHoaro/Public-GitLab,achako/gitlabhq,ayufan/gitlabhq,kitech/gitlabhq,martijnvermaat/gitlabhq,jairzh/gitlabhq-sfdc,mavimo/gitlabhq,stoplightio/gitlabhq,mente/gitlabhq,koreamic/gitlabhq,bozaro/gitlabhq,larryli/gitlabhq,bladealslayer/gitlabhq,screenpages/gitlabhq,rumpelsepp/gitlabhq,SkyWei/gitlabhq,sonalkr132/gitlabhq,screenpages/gitlabhq,nuecho/gitlabhq,Razer6/gitlabhq,MauriceMohlek/gitlabhq,DanielZhangQingLong/gitlabhq,bladealslayer/gitlabhq,t-zuehlsdorff/gitlabhq,stanhu/gitlabhq,jvanbaarsen/gitlabhq,hacsoc/gitlabhq,sekcheong/gitlabhq,NuLL3rr0r/gitlabhq,wangcan2014/gitlabhq,mmkassem/gitlabhq,johnmyqin/gitlabhq,darkrasid/gitlabhq,zrbsprite/gitlabhq,sue445/gitlabhq,yfaizal/gitlabhq,lbt/gitlabhq,tim-hoff/gitlabhq,openwide-java/gitlabhq,Datacom/gitlabhq,fpgentil/gitlabhq,flashbuckets/gitlabhq,8thcolor/eurucamp2014-htdsadr,mr-dxdy/gitlabhq,jirutka/gitlabhq,martinma4/gitlabhq,julianengel/gitlabhq,cinderblock/gitlabhq,tempbottle/gitlabhq,stellamiranda/mobbr-gitlabhq,fearenales/gitlabhq,stoplightio/gitlabhq,jrjang/gitlabhq,DanielZhangQingLong/gitlabhq,robbkidd/gitlabhq,sonalkr132/gitlabhq,NKMR6194/gitlabhq,sakishum/gitlabhq,shinexiao/gitlabhq,phinfonet/mobbr-gitlabhq,SkyWei/gitlabhq,goeun/myRepo,manfer/gitlabhq,kotaro-dev/gitlab-6-9,nuecho/gitlabhq,johnmyqin/gitlabhq,Keystion/gitlabhq,it33/gitlabhq,123Haynes/gitlabhq,dukex/gitlabhq,jrjang/gitlabhq,revaret/gitlabhq,chrrrles/nodeflab,pulkit21/gitlabhq,yonglehou/gitlabhq,youprofit/gitlabhq,zrbsprite/gitlabhq,whluwit/gitlabhq,adaiguoguo/gitlab_globalserarch,mavimo/gitlabhq,jairzh/gitlabhq-sfdc,ksoichiro/gitlabhq,dyon/gitlab,vjustov/gitlabhq,tempbottle/gitlabhq,chadyred/gitlabhq,mavimo/gitlabhq,martinma4/gitlabhq,fendoudeqingchunhh/gitlabhq,dplarson/gitlabhq,larryli/gitlabhq,per-garden/gitlabhq,neiljbrookes/glab,windymid/test2,it33/gitlabhq,fantasywind/gitlabhq,pulkit21/gitlabhq,htve/GitlabForChinese,aaronsnyder/gitlabhq,copystudy/gitlabhq,shinexiao/gitlabhq,nguyen-tien-mulodo/gitlabhq,hacsoc/gitlabhq,michaKFromParis/gitlabhqold,since2014/gitlabhq,pkallberg/tjenare,sue445/gitlabhq,ArthurHoaro/Public-GitLab,dwrensha/gitlabhq,OtkurBiz/gitlabhq,michaKFromParis/gitlabhqold,sue445/gitlabhq,michaKFromParis/sparkslab,LUMC/gitlabhq,rhels/gitlabhq,martinma4/gitlabhq,achako/gitlabhq,Kambda/mobbr-gitlabhq,screenpages/gitlabhq,theonlydoo/gitlabhq,lbt/gitlabhq,joalmeid/gitlabhq,gorgee/gitlabhq,per-garden/gitlabhq,rfeese/gitlab-ce,liyakun/gitlabhq,bigsurge/gitlabhq,fantasywind/gitlabhq,bbodenmiller/gitlabhq,ksoichiro/gitlabhq,H3Chief/gitlabhq,dplarson/gitlabhq,ksoichiro/gitlabhq,yuyue2013/ss,bbodenmiller/gitlabhq,jrjang/gitlab-ce,williamherry/gitlabhq,julianengel/gitlabhq,folpindo/gitlabhq,mmkassem/gitlabhq,k4zzk/gitlabhq,yama07/gitlabhq,whluwit/gitlabhq,cncodog/gitlab,bbodenmiller/gitlabhq,kitech/gitlabhq,dyon/gitlab,louahola/gitlabhq,123Haynes/gitlabhq,ferdinandrosario/gitlabhq,ttasanen/gitlabhq,t-zuehlsdorff/gitlabhq,fpgentil/gitlabhq,ferdinandrosario/gitlabhq,0x20h/gitlabhq,rebecamendez/gitlabhq,123Haynes/gitlabhq,koreamic/gitlabhq,dreampet/gitlab,johnmyqin/gitlabhq,SkyWei/gitlabhq,hzy001/gitlabhq,pkgr/gitlabhq,allysonbarros/gitlabhq,LUMC/gitlabhq,zBMNForks/gitlabhq,inetfuture/gitlab-tweak,salipro4ever/gitlabhq,stanhu/gitlabhq,Razer6/gitlabhq,pupaxxo/gitlabhq,fgbreel/gitlabhq,Telekom-PD/gitlabhq,ksoichiro/gitlabhq,nmav/gitlabhq,yuyue2013/ss,whluwit/gitlabhq,pkgr/gitlabhq,gopeter/gitlabhq,hacsoc/gitlabhq,jrjang/gitlabhq,fgbreel/gitlabhq,CodeCantor/gitlabhq,Datacom/gitlabhq,eliasp/gitlabhq,since2014/gitlabhq,WSDC-NITWarangal/gitlabhq,folpindo/gitlabhq,kemenaran/gitlabhq,theodi/gitlabhq,NKMR6194/gitlabhq,allysonbarros/gitlabhq,riyad/gitlabhq,OlegGirko/gitlab-ce,sue445/gitlabhq,daiyu/gitlab-zh,hq804116393/gitlabhq,rumpelsepp/gitlabhq,louahola/gitlabhq,bbodenmiller/gitlabhq,daiyu/gitlab-zh,vjustov/gitlabhq,jirutka/gitlabhq,pjknkda/gitlabhq,kitech/gitlabhq,nuecho/gitlabhq,k4zzk/gitlabhq,louahola/gitlabhq,folpindo/gitlabhq,dvrylc/gitlabhq,DanielZhangQingLong/gitlabhq,axilleas/gitlabhq,phinfonet/mobbr-gitlabhq,mrb/gitlabhq,allistera/gitlabhq,NARKOZ/gitlabhq,LUMC/gitlabhq,zBMNForks/gitlabhq,dreampet/gitlab,Burick/gitlabhq,ikappas/gitlabhq,Kambda/Mobbr,per-garden/gitlabhq,dvrylc/gitlabhq,stellami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