Fix return class of check_model() patchwork

[bwiernik]

Closes easystats/performance#712

[bwiernik]

The R CMD Checks look good--not sure about the other workflows

[bwiernik]

@strengejacke the issue was that apparently invisible() doesn't also return unless it's the last line of the function and gets the implicit return. I didn't realize that

[strengejacke]

The R CMD Checks look good--not sure about the other workflows

I think you can ignore the other workflows. They error due to warnings which are hard to silence.
@IndrajeetPatil do you have any ideas how to handle the failing workflows?

[IndrajeetPatil]

We just need to fix the new warnings generated by ggplot2 3.5.0; I am waiting for ggplot2 3.5.1, which would silence some of these warnings.