Comment # 3 on bug 942852 from Michael Andres

Interactively 'you' get the message that no provider for an argument was found
and 'you' confirm the summary.

Non-interactive zypper can't judge, whether it's ok or not, so the safe default
is to stop. If you want zypper to ignore it, you can must tell it:

> [man zypper]
> GLOBAL OPTIONS
> ...
>        -i, --ignore-unknown
>            Ignore unknown packages. This option is useful for scripts.