Fix Cache Hit rate metric for Completable Future GET API #174
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Problem
The getAsync() CompletableFuture API was incorrectly reporting 100% cache hit rate because it called handleData() for all successful completions, even when the returned data was null (cache miss).
Solution
Added a null check to properly distinguish between cache hits (data != null) and cache misses (data == null), ensuring accurate hit rate metrics that match the behavior of synchronous get operations.