Fixes #3505: Another try to fix the NPE in the search bar

[tobiasdiez]

Fiexes #3505

I think, I managed to locate the problem of the NPE and the missing search bar. Apparently, in some conditions the syntax ../ to access the parent in a path does not work for resources. Thus the css file is not found, resulting in a NPE.

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• Change in CHANGELOG.md described (bug introduced in 4.1dev)
• Tests created for changes
• Screenshots added (for bigger UI changes)
• Manually tested changed features in running JabRef
• Check documentation status (Issue created for outdated help page at help.jabref.org?)
• If you changed the localization: Did you run gradle localizationUpdate?

[Siedlerchr]

Good catch. Seems really odd this error only occurs on certain systems

[koppor]

Search bar appears here. I think, @j0hannes should run the build at his system. Currently, one has to checkout the code and execute ./gradlew run as we currently have issues with our code signing certificate.

[j0hannes]

@koppor I just rebuilt the package from git and the search bar is still not there.

[tobiasdiez]

@j0hannes did you checked-out the branch fix3505 or still used the master? Since this PR is not yet merged, the fix is not included in the master branch. If you used the correct branch to build, is the same error message still there?

[tobiasdiez]

Anyway, I merge this now since the code still works under normal conditions and might help in others. So a new checkout of the master branch should work now.

[j0hannes]

@tobiasdiez Now it's back. The package will certainly only use the master branch; I though it was already merged there.

[tobiasdiez]

@j0hannes thanks for the feedback and your help debugging this issue! Much appreciated.