Fixed NPE in Precondition

[ben-Draeger]

The DescriptionModificationUptPrecondition (amongst others) threw a NullPointerException when encountering a DescriptionModificationReport containing a ReportPart without a ModificationType attribute.

This should fix the problem.

Checklist

The following aspects have been respected by the author of this pull request, confirmed by both pull request assignee and reviewer:

• Adherence to coding conventions
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• Adherence to javadoc conventions
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• Changelog update (necessity checked and entry added or not added respectively)
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• README update (necessity checked and entry added or not added respectively)
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• config update (necessity checked and entry added or not added respectively)
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• SDCcc executable ran against a test device (if necessary)
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[maximilianpilz]

please fix the build, it failed, and change the date of the copyright notice in the license headers of the files which you changed

[ben-Draeger]

The licence header check fails because I updated the license header in the 2 files I touched.
This can be rectified by merging in the change from PR #134, which introduced a more powerful github action for licence header checking that can deal with this type of headers.

[maximilianpilz]

please make use of the new license check from the main branch

[ben-Draeger]

The Licence check was merged in from the main branch and it seems to work fine.