Don't write to log NoCommitterAccount (#3621)
Don't write to log NoCommitterAccount (#3621)

* Don't write to log NoCommitterAccount

It's way too verbose, and the information is also printed to the user
already. Fixes #3602.

* ignore err only if it's a ErrUserNotExist

* Replace with IsErrUserNotExist

dnmgns/gitea,tboerger/gitea,vCaesar/gitea,lunny/gitea,lunny/gitea,go-gitea/gitea,cez81/gitea,kjellkvinge/gitea,vCaesar/gitea,lafriks/gitea,lafriks/gitea,dnmgns/gitea,sapk-fork/gitea,sapk-fork/gitea,cez81/gitea,typeless/gitea,sapk-fork/gitea,vdbt/gitea,Bwko/gitea,kjellkvinge/gitea,typeless/gitea,sapk-fork/gitea,kubatyszko/gitea,tboerger/gitea,kubatyszko/gitea,kubatyszko/gitea,dnmgns/gitea,go-gitea/gitea,Bwko/gitea,Bwko/gitea,typeless/gitea,cez81/gitea,kjellkvinge/gitea,lafriks/gitea,go-gitea/gitea,tboerger/gitea,lunny/gitea,vdbt/gitea,typeless/gitea