Split command returns success even if the sub-model to be split does not exists.

[vikas-agarwal76]

When I generate a catalog using generators, it does not generate metadata.props.

But when I run the following command -

trestle split -f 'catalog.json' -e 'catalog.metadata' and then go to /catalog and do trestle split -f 'metadata.json' -e 'metadata.props'

it returns success. Ideally it should return failure as metadata.props does not exist.