brew.sh: improve empty argument handling
brew.sh: improve empty argument handling

Follow-up to Homebrew/homebrew#49327 that leaves empty argument handling to the Ruby code
(it is a bit more sophisticated and distinguished between `help` and an
empty argument list and treats them differently) instead of hard-wiring
the former to the `help` command.

Closes Homebrew/homebrew#49538.

Signed-off-by: Martin Afanasjew <54669547a225ff20cba8b75a4adca540eef25858@afanasjew.de>

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