WordPress-Android fix: potential null dereference on serviceId

In file: PublicizeTable.java there is the following code segment

if (serviceId == null && serviceId.isEmpty()) {
            return false;
        }

if the serviceId value is null then then logical if check result in NullPointerException due to && operator.

To Test:

Regression Notes

Potential unintended areas of impact
- null pointer dereference
What I did to test those areas of impact (or what existing automated tests I relied on)
- The bug is found by running the iCR tool by OpenRefactory, Inc. and then manually triaging the results.
What automated tests I added (or what prevented me from doing so)
- this is a potential null pointer which results due to inappropriate && operator in this specific case.

PR Submission Checklist:

[x] I have completed the Regression Notes.
[x] I have considered adding accessibility improvements for my changes.
[x] I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

UI Changes Testing Checklist:

[ ] Portrait and landscape orientations.
[ ] Light and dark modes.
[ ] Fonts: Larger, smaller and bold text.
[ ] High contrast.
[ ] Talkback.
[ ] Languages with large words or with letters/accents not frequently used in English.
[ ] Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
[ ] Large and small screen sizes. (Tablet and smaller phones)
[ ] Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

Sponsorship and Support:

This work is done by the security researchers from OpenRefactory and is supported by the Open Source Security Foundation (OpenSSF): Project Alpha-Omega. Alpha-Omega is a project partnering with open source software project maintainers to systematically find new, as-yet-undiscovered vulnerabilities in open source code - and get them fixed - to improve global software supply chain security.

The bug is found by running the iCR tool by OpenRefactory, Inc. and then manually triaging the results.