Fix cache update when forgetting player

[R-Gld]

Summary

• guard against null values in Data#forgotPlayer

Testing

• mvn -q -DskipTests package (fails: mvn not found)

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https://chatgpt.com/codex/tasks/task_e_68407c849ae08327b0bb3f3f5d574ca2

[github-actions]

Qodana Community for JVM

42 new problems were found

Inspection name	Severity	Problems
Call to 'printStackTrace()'	🔶 Warning	23
Result of method call ignored	🔶 Warning	4
Unchecked warning	🔶 Warning	4
AutoCloseable used without 'try'-with-resources	🔶 Warning	1
Constant values	🔶 Warning	1
Nullability and data flow problems	🔶 Warning	1
Deprecated API usage	🔶 Warning	1
Field can be local	🔶 Warning	1
Link specified as plain text	🔶 Warning	1
Suspicious 'Collection.toArray()' call	🔶 Warning	1
Commented out code	◽️ Notice	3
Method can be extracted	◽️ Notice	1

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[R-Gld]

OpenAI Codex PR test.