Fix metric infos in PartitionThroughputProvider #862
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shrinandthakkar
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Co-authored-by: Vaibhav Maheshwari <vmaheshw@vmaheshw-mn1.linkedin.biz>
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Fixing the below exception by setting the default to return empty list rather than null.
Caused by: java.lang.NullPointerException at java.util.ArrayList.addAll(ArrayList.java:702) ~[?:?] at com.linkedin.datastream.server.assignment.LoadBasedPartitionAssignmentStrategy.getMetricInfos(LoadBasedPartitionAssignmentStrategy.java:218) ~[datastream-server-2.3.0.jar:?] at com.linkedin.datastream.server.Coordinator$CoordinatorMetrics.addMetricInfos(Coordinator.java:1984) ~[datastream-server-2.3.0.jar:?] at com.linkedin.datastream.server.Coordinator$CoordinatorMetrics.addConnectorMetrics(Coordinator.java:2005) ~[datastream-server-2.3.0.jar:?] at com.linkedin.datastream.server.Coordinator.addConnector(Coordinator.java:1598)~[datastream-server-2.3.0.jar:?]`