fix(ControllerMethod): Log an error if return statements are detected but no @return annotation is present

[provokateurin]

We already log an error if no response is returned from a controller method, but that is also satisfied if a @throws annotation is present.
Luckily with the return statements we can easily check if any is present (there might be controller methods that only throw or never return), so a separate error is now logged in case the code has a return statement but no @return annotation.

[provokateurin]

Looks like we're lucky and none of the apps we currently check in CI has this problem.

[come-nc]

No test for it?

[come-nc]

Looks like we're lucky and none of the apps we currently check in CI has this problem.

It’s not luck it’s good work 🤝

(Or the check is not working 🤷 )

[provokateurin]

No test for it?

We can not do negative testing with out integration tests :/

Or the check is not working

But I can assure you that I tested this on a https://github.com/nextcloud/end_to_end_encryption and it correctly flags the methods that have this problem :)