Set output directry in case of outputDirectory in OutputBuildTargetItem is null

[AkMo3]

Fixes: #23759
Proof of working in https://github.com/AkMo3/Quarkus-Test-Builds/tree/master/quarkus-my-ext

[aloubyansky]

The proposed fix should probably become the main logic. I looked into why the output dir is missing in the original issue and #23859 should fix it. Although the way we are locating the build/target dir in other places is kind of a hack.

[aloubyansky]

We should look into utilizing the ApplicationModel to set up all the paths when we bootstrap for tests though.

[AkMo3]

We should look into utilizing the ApplicationModel to set up all the paths when we bootstrap for tests though.

Yeah. Any rough idea how we can do this, I would be happy to contribute.
Also, I guess we should close this PR now as it would be redundant after #23859

[aloubyansky]

I was thinking we could actually initialize some of these paths (in case they haven't been set) from the ApplicationModel (existing or resolved) in the QuarkusBootstrap. It might not end up being a quick fix though.

[AkMo3]

I was thinking we could actually initialize some of these paths (in case they haven't been set) from the ApplicationModel (existing or resolved) in the QuarkusBootstrap. It might not end up being a quick fix though.

Sure. I try to implement a fix and would contact you in Zulip if required any further help :)
( I am just familiarizing myself with the project now and would love to contribute more)

Also, please close the PR at your convenience, I am not closing currently as if @stuartwdouglas wanted to add any more comments.