If `--onlyPlugins` filters out all plugins an empty result shows without a warning

[BioPhoton]

What happened?

I ran code-pushup collec --onlyPlugins non-existing-plugin and an empty report appeared in the terminal

What would you expect to happen?

A warning ahould show up in the terminal

What steps did you take?

Run code-pushup collec --onlyPlugins non-existing-plugin

Output:

Code PushUp package version

No response

What operation system are you on?

MacOS

Node version

No response

Relevant log output

No response