Docker: fix showing missing image message and '--docker-auto-pull'
Docker: fix showing missing image message and '--docker-auto-pull'

narrative/stack,MichielDerhaeg/stack,martin-kolinek/stack,anton-dessiatov/stack,AndrewRademacher/stack,rubik/stack,juhp/stack,keent/stack,luigy/stack,deech/stack,sjakobi/stack,deech/stack,juhp/stack,harendra-kumar/stack,achernyak/stack,Blaisorblade/stack,Fuuzetsu/stack,martin-kolinek/stack,AndreasPK/stack,MichielDerhaeg/stack,luigy/stack,AndrewRademacher/stack,anton-dessiatov/stack,Blaisorblade/stack,sjakobi/stack,harendra-kumar/stack,Heather/stack,Heather/stack,phadej/stack,AndreasPK/stack,achernyak/stack,keent/stack,mrkkrp/stack,rubik/stack,narrative/stack,mrkkrp/stack,phadej/stack,Fuuzetsu/stack