BUGFIX: Fix exit code for unresolved CLI commands
BUGFIX: Fix exit code for unresolved CLI commands

Fixes the exit code of

    ./flow non:existing:command

to be 1 instead of 0.

Fixes: #1504

dlubitz/flow-development-collection,bwaidelich/flow-development-collection,robertlemke/flow-development-collection,robertlemke/flow-development-collection,kdambekalns/flow-development-collection,fcool/flow-development-collection,dlubitz/flow-development-collection,neos/flow-development-collection,kdambekalns/flow-development-collection,daniellienert/flow-development-collection,albe/flow-development-collection,neos/flow-development-collection,bwaidelich/flow-development-collection,robertlemke/flow-development-collection,daniellienert/flow-development-collection,albe/flow-development-collection,kdambekalns/flow-development-collection,bwaidelich/flow-development-collection,fcool/flow-development-collection,daniellienert/flow-development-collection,kdambekalns/flow-development-collection,fcool/flow-development-collection,neos/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,dlubitz/flow-development-collection,neos/flow-development-collection,robertlemke/flow-development-collection