Cluster metrics can fail with IndexOutOfBoundsException

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
 at java.util.ArrayList.rangeCheck(ArrayList.java:653)
 at java.util.ArrayList.get(ArrayList.java:429)
 at org.apache.hadoop.yarn.server.router.clientrm.FederationClientInterceptor.invokeConcurrent(FederationClientInterceptor.java:654)
 at org.apache.hadoop.yarn.server.router.clientrm.FederationClientInterceptor.getClusterMetrics(FederationClientInterceptor.java:604)
 at org.apache.hadoop.yarn.server.router.clientrm.RouterClientRMService.getClusterMetrics(RouterClientRMService.java:232)
 at org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.getClusterMetrics(ApplicationClientProtocolPBServiceImpl.java:253)
 at org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:585)
 at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
 at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
 at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:872)