bump-formula-pr: fix for when hub isn't configured
bump-formula-pr: fix for when hub isn't configured

alyssais/brew,mgrimes/brew,konqui/brew,nandub/brew,Homebrew/brew,sjackman/homebrew,mahori/brew,MikeMcQuaid/brew,DomT4/brew,pseudocody/brew,vitorgalvao/brew,maxim-belkin/brew,MikeMcQuaid/brew,maxim-belkin/brew,Homebrew/brew,ilovezfs/brew,aw1621107/brew,JCount/brew,reitermarkus/brew,sjackman/homebrew,reelsense/brew,ilovezfs/brew,sjackman/homebrew,ilovezfs/brew,hanxue/linuxbrew,EricFromCanada/brew,nandub/brew,Linuxbrew/brew,claui/brew,konqui/brew,vitorgalvao/brew,aw1621107/brew,reitermarkus/brew,vitorgalvao/brew,Linuxbrew/brew,mgrimes/brew,mahori/brew,pseudocody/brew,reelsense/brew,konqui/brew,Linuxbrew/brew,MikeMcQuaid/brew,alyssais/brew,Homebrew/brew,vitorgalvao/brew,mgrimes/brew,maxim-belkin/brew,EricFromCanada/brew,DomT4/brew,JCount/brew,Linuxbrew/brew,nandub/brew,EricFromCanada/brew,Homebrew/brew,EricFromCanada/brew,alyssais/brew,DomT4/brew,hanxue/linuxbrew,claui/brew,aw1621107/brew,pseudocody/brew,sjackman/homebrew,JCount/brew,mahori/brew,nandub/brew,reitermarkus/brew,MikeMcQuaid/brew,claui/brew,mahori/brew,hanxue/linuxbrew,reitermarkus/brew,claui/brew,konqui/brew,JCount/brew,DomT4/brew,reelsense/brew