CLI: Exit with code > 0 in case of an error
Schleuder currently exits always with code 0 if it fails to recognize the sub-command:
> ./bin/schleuder bla
Could not find command "bla".
> echo $?
0
Schleuder currently exits always with code 0 if it fails to recognize the sub-command:
> ./bin/schleuder bla
Could not find command "bla".
> echo $?
0