REST API: Restore `is_array()` check in `rest_convert_error_to_response()`#11307

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nate-allen:fix/rest-convert-error-stdclass

Commits on Mar 19, 2026

REST API: Restore `is_array()` check in `rest_convert_error_to_response()`.
nate-allen
committed
Revert to original isset() ternary instead of null coalescing with is_array().
nate-allen
committed
Add inline comment explaining the is_array() check.
nate-allen
committed