src: Error out on unmapped key in `g` and `v`
src: Error out on unmapped key in `g` and `v`

Fixes #4353.

casimir/kakoune,jkonecny12/kakoune,mawww/kakoune,jkonecny12/kakoune,mawww/kakoune,alexherbo2/kakoune,mawww/kakoune,casimir/kakoune,casimir/kakoune,jkonecny12/kakoune,mawww/kakoune,alexherbo2/kakoune,alexherbo2/kakoune,jkonecny12/kakoune,casimir/kakoune,alexherbo2/kakoune