Use Repository#exists? in Repository#commit?
Use Repository#exists? in Repository#commit?

Just checking raw_repository is no longer accurate to determine if a
repository exists or not.

openwide-java/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,screenpages/gitlabhq,LUMC/gitlabhq,axilleas/gitlabhq,Soullivaneuh/gitlabhq,dplarson/gitlabhq,mmkassem/gitlabhq,darkrasid/gitlabhq,dreampet/gitlab,allysonbarros/gitlabhq,stoplightio/gitlabhq,screenpages/gitlabhq,martijnvermaat/gitlabhq,icedwater/gitlabhq,SVArago/gitlabhq,larryli/gitlabhq,openwide-java/gitlabhq,iiet/iiet-git,dwrensha/gitlabhq,icedwater/gitlabhq,jirutka/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,larryli/gitlabhq,htve/GitlabForChinese,Soullivaneuh/gitlabhq,screenpages/gitlabhq,allysonbarros/gitlabhq,ttasanen/gitlabhq,jirutka/gitlabhq,dplarson/gitlabhq,allysonbarros/gitlabhq,dwrensha/gitlabhq,openwide-java/gitlabhq,mr-dxdy/gitlabhq,iiet/iiet-git,ttasanen/gitlabhq,martijnvermaat/gitlabhq,shinexiao/gitlabhq,axilleas/gitlabhq,martijnvermaat/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,mr-dxdy/gitlabhq,shinexiao/gitlabhq,larryli/gitlabhq,ttasanen/gitlabhq,SVArago/gitlabhq,mr-dxdy/gitlabhq,martijnvermaat/gitlabhq,htve/GitlabForChinese,larryli/gitlabhq,shinexiao/gitlabhq,dreampet/gitlab,darkrasid/gitlabhq,shinexiao/gitlabhq,dplarson/gitlabhq,daiyu/gitlab-zh,darkrasid/gitlabhq,dreampet/gitlab,openwide-java/gitlabhq,ttasanen/gitlabhq,Soullivaneuh/gitlabhq,LUMC/gitlabhq,htve/GitlabForChinese,iiet/iiet-git,LUMC/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,dwrensha/gitlabhq,screenpages/gitlabhq,daiyu/gitlab-zh,htve/GitlabForChinese,mr-dxdy/gitlabhq,icedwater/gitlabhq,daiyu/gitlab-zh,stoplightio/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,axilleas/gitlabhq,Soullivaneuh/gitlabhq,dwrensha/gitlabhq,daiyu/gitlab-zh,jirutka/gitlabhq,darkrasid/gitlabhq,SVArago/gitlabhq,icedwater/gitlabhq,LUMC/gitlabhq,t-zuehlsdorff/gitlabhq,SVArago/gitlabhq,allysonbarros/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq