SCM does not throw proper errors

[ChristophLHR]

Editted by @ColdIV:
Old title: "SCM does not throw errors when scripts are not found"

When something goes wrong in a way that a task cannot be completed, SCM should always throw an error.
If something cannot be found initially but SCM is able to somehow handle everything, there should not be an error, at least not if verbose is disabled.

[ColdIV]

There are some errors for scripts that are not found, though they are hidden behind the verbose flag, which isn't optimal.
I would suggest to expand this issue to implement proper error handling in generel for the SCM.