Avoid empty alternative command buckets - #6623
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Information
This PR fixes #6608.
Details
Proposed fix:
When stale WeakReference entries are removed from an alternative-command bucket, the bucket can become empty before the fallback lookup. Return null instead of reading index 0. A regression test covers a bucket whose entries have all been collected.
Environments tested:
OS: macOS
Java version: 21
Demonstration:
The regression test fails on the previous code with IndexOutOfBoundsException in getAlternative, and passes with this change. The full EssentialsX module suite also passes (35 tests).