Fix Reflections' WARN log when jsonDir doesn't exist. #184
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Motivation:
When com.linecorp.armeria.thrift.jsonDir doesn't exist, WARN log will occured.
12:04:57.463 [WARN ](o.r.Reflections) [main] given scan urls are empty. set urls in the configuration
Modifications:
Check jsonDir before scan.
Result:
DocService will not warn when jsonDir doesn't exist.