The log level we get in `beforeAnalysis` may be null, in which case we still want to reset it after analysis.

From the javadoc of Logger#getLevel:

> Get the log Level that has been specified for this Logger.
> The result may be null, which means that this logger's effective level will be inherited from its parent.

Related: https://github.com/quarkusio/quarkus/pull/40365#issuecomment-2092997301 , where I noticed the bug.