create: handle Version::NULL correctly.
create: handle Version::NULL correctly.

Fixes #1688.

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