Fix NullPointerException on null rows in table

[fellmann]

Description of the new Feature/Bugfix

Describe here how you fixed the bug, or implemented the new feature.

Related Issue: #1028

Unit-Tests for the new Feature/Bugfix

• Unit-Tests added to reproduce the bug

[fellmann]

@andreasrosdal This would be my approach. Note the null pointer check in the first loop instead of second.
The first loop (https://github.com/LibrePDF/OpenPDF/pull/1029/files#diff-f8ff0e0467d7f9125d29b3c1f5f96b40a8bb603ae719effd248bdd3f97753d97L882) lists all rows within the rowspan that should be used to distribute the excess height, which is then done in the second loop. So the null check in the first loop is sufficient.
Yet, there are more places where no null check is done, I tried to fix those too.

[sonarqubecloud]

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