Fix NPE when calling ParsingException constructors with null reason

[SirYwell]

A per the Javadocs, null values are permitted for the reason, however passing null or using a constructor that doesn't take a String causes a NullPointerException.

I addressed this issue and created a regression test for it.

Note: String#isBlank returns true if the string is empty, so this check wasn't needed.

[tsaglam]

Your branch is based on main but should be based on develop.

[SirYwell]

From my understanding of the comment in the pull request template https://github.com/jplag/JPlag/blob/main/.github/pull_request_template.md?plain=1#L3 together with semver (https://semver.org/#summary)

PATCH version when you make backwards compatible bug fixes

I thought main would be the appropriate branch. I can change the branch, but I think the template is confusing then.

[JanWittler]

That's true, but your PR was targeting the develop branch. I adjusted it.

[JanWittler]

Just one smaller comment, besides that looks fine

[tsaglam]

I would still merge it into develop, as I am probably not releasing a patch version for this alone (I changed the target initially to develop).

[SirYwell]

I would still merge it into develop, as I am probably not releasing a patch version for this alone (I changed the target initially to develop).

I changed the target branch and rebased the commit onto develop.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information