Add null checks for guest account ids, Fixes AB#3330213

[melissaahn]

Summary

AB#3330213

We got a report from a partner team that they were seeing very low amounts (like 5 instances) of an NPE related to AccountAdapter. Looking at past related issues, this seems like some account entry data got malformed for particular accounts/devices, perhaps due to very old broker versions. The patch in this PR is to add null checks for both the home and local id from the guest account, and if either are null, then it won't be added to the guest account array.

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[Copilot]

Pull Request Overview

This PR adds null safety checks to prevent NPE (NullPointerException) when processing guest account IDs in the AccountAdapter, addressing a production issue where malformed account data caused crashes.

• Added null checks for both home and local account IDs before performing string operations
• Updated changelog to document the patch

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
AccountAdapter.java	Added null validation for home and local account IDs to prevent NPE when filtering guest accounts
changelog	Documented the patch for guest account ID null checks

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