MLE-24717 Small Polaris fix

[rjrudin]

This is really a false positive from Polaris, but it makes sense to declare cause right away.

[Copilot]

Pull Request Overview

Addresses a Polaris static analysis false positive by declaring the cause variable earlier in the exception handling method. This ensures the variable is available before its first usage in the instanceof check.

• Moved variable declaration to the beginning of the method
• Maintained existing exception handling logic

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[github-actions]

Copyright Validation Results
Total: 1 | Passed: 1 | Failed: 0 | Skipped: 0 | at: 2025-10-13 17:35:41 UTC | commit: a6b85a3

✅ Valid Files

• flux-cli/src/main/java/com/marklogic/flux/impl/AbstractCommand.java

✅ All files have valid copyright headers!