Fix NPE of JVMInfo in DetailedAgentInfo

[emeroad]

NPE occurs in the agent information of the inspector in the node agent or go agent.

{
    "timestamp": 1660210254944,
    "status": 500,
    "error": "Internal Server Error",
    "exception": "java.lang.NullPointerException",
    "trace": "java.lang.NullPointerException: jvmInfo
java.base/java.util.Objects.requireNonNull(Objects.java:246)
com.navercorp.pinpoint.web.vo.agent.DetailedAgentInfo.<init>(DetailedAgentInfo.java:20)
com.navercorp.pinpoint.web.mapper.DetailedAgentInfoResultsExtractor.extractData(DetailedAgentInfoResultsExtractor.java:54)
com.navercorp.pinpoint.web.mapper.DetailedAgentInfoResultsExtractor.extractData(DetailedAgentInfoResultsExtractor.java:35
com.navercorp.pinpoint.common.hbase.HbaseTemplate2$1.doInTable(HbaseTemplate2.java:185)
...