audit: don't try to audit missing deps
audit: don't try to audit missing deps

Refs Homebrew/homebrew#20829.

palxex/brew,EricFromCanada/brew,DomT4/brew,mgrimes/brew,rwhogg/brew,tonyg/homebrew,MikeMcQuaid/brew,aw1621107/brew,rwhogg/brew,pseudocody/brew,EricFromCanada/brew,reitermarkus/brew,toonetown/homebrew,hanxue/linuxbrew,alyssais/brew,nandub/brew,reelsense/brew,claui/brew,DomT4/brew,aw1621107/brew,mgrimes/brew,mahori/brew,gregory-nisbet/brew,JCount/brew,staticfloat/brew,zmwangx/brew,rwhogg/brew,JCount/brew,amar-laksh/brew_sudo,jmsundar/brew,zmwangx/brew,AnastasiaSulyagina/brew,DomT4/brew,gordonmcshane/homebrew,bfontaine/brew,toonetown/homebrew,mgrimes/brew,DomT4/brew,claui/brew,konqui/brew,mahori/brew,AnastasiaSulyagina/brew,jmsundar/brew,mahori/brew,sjackman/homebrew,aw1621107/brew,alyssais/brew,reitermarkus/brew,ilovezfs/brew,claui/brew,konqui/brew,EricFromCanada/brew,reelsense/brew,nandub/brew,Linuxbrew/brew,hanxue/linuxbrew,amar-laksh/brew_sudo,muellermartin/dist,ilovezfs/brew,Homebrew/brew,vitorgalvao/brew,Linuxbrew/brew,staticfloat/brew,reitermarkus/brew,JCount/brew,jmsundar/brew,staticfloat/brew,pseudocody/brew,konqui/brew,AnastasiaSulyagina/brew,ilovezfs/brew,MikeMcQuaid/brew,toonetown/homebrew,sjackman/homebrew,alyssais/brew,mistydemeo/homebrew,mahori/brew,gregory-nisbet/brew,tonyg/homebrew,reelsense/brew,amar-laksh/brew_sudo,pseudocody/brew,vitorgalvao/brew,muellermartin/dist,konqui/brew,mistydemeo/homebrew,palxex/brew,nandub/brew,nandub/brew,vitorgalvao/brew,Homebrew/brew,JCount/brew,mistydemeo/homebrew,MikeMcQuaid/brew,claui/brew,muellermartin/dist,sjackman/homebrew,Homebrew/brew,hanxue/linuxbrew,maxim-belkin/brew,gordonmcshane/homebrew,Homebrew/brew,palxex/brew,gordonmcshane/homebrew,sjackman/homebrew,bfontaine/brew,gregory-nisbet/brew,maxim-belkin/brew,reitermarkus/brew,maxim-belkin/brew,tonyg/homebrew,Linuxbrew/brew,vitorgalvao/brew,zmwangx/brew,Linuxbrew/brew,MikeMcQuaid/brew,bfontaine/brew,EricFromCanada/brew