Errors in openolt-adapter logs when OLT deleted

{
  "level": "error",
  "ts": "2019-12-18T21:34:29.576Z",
  "msg": "Indications ended",
  "instanceId": "adapter-open-olt-6c87bfdcd8-v2qlz",
  "caller": "device_handler.readIndications:334",
  "stacktrace": "github.com/opencord/voltha-lib-go/v2/pkg/log.Errorw\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/log/log.go:721\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*DeviceHandler).readIndications\n\t/go/src/adaptercore/device_handler.go:334"
}
{
  "level": "error",
  "ts": "2019-12-18T21:34:38.098Z",
  "msg": "Update_flows_incrementally failed-device-handler-not-set",
  "instanceId": "adapter-open-olt-6c87bfdcd8-v2qlz",
  "caller": "openolt.Update_flows_incrementally:286",
  "deviceId": "fc726cfe34ed814ff957a8f7",
  "stacktrace": "github.com/opencord/voltha-lib-go/v2/pkg/log.Errorw\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/log/log.go:721\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOLT).Update_flows_incrementally\n\t/go/src/adaptercore/openolt.go:286\ngithub.com/opencord/voltha-lib-go/v2/pkg/adapters/common.(*RequestHandlerProxy).Update_flows_incrementally\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/adapters/common/request_handler.go:398\nreflect.Value.call\n\t/usr/local/go/src/reflect/value.go:447\nreflect.Value.Call\n\t/usr/local/go/src/reflect/value.go:308\ngithub.com/opencord/voltha-lib-go/v2/pkg/kafka.CallFuncByName\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/kafka/kafka_inter_container_library.go:601\ngithub.com/opencord/voltha-lib-go/v2/pkg/kafka.(*InterContainerProxy).handleMessage\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/kafka/kafka_inter_container_library.go:660"
}
{
  "level": "error",
  "ts": "2019-12-18T21:34:38.719Z",
  "msg": "failure sending del tcont to onu adapter",
  "instanceId": "adapter-open-olt-6c87bfdcd8-v2qlz",
  "caller": "openolt_flowmgr.sendDeleteTcontToChild:1277",
  "fromAdapter": "openolt",
  "toAdapter": "brcm_openomci_onu",
  "onuId": "b0a0cc383219bfdcb94cd789",
  "proxyDeviceId": "fc726cfe34ed814ff957a8f7",
  "stacktrace": "github.com/opencord/voltha-lib-go/v2/pkg/log.Errorw\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/log/log.go:721\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOltFlowMgr).sendDeleteTcontToChild\n\t/go/src/adaptercore/openolt_flowmgr.go:1277\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOltFlowMgr).clearResources\n\t/go/src/adaptercore/openolt_flowmgr.go:1402\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOltFlowMgr).clearFlowFromResourceManager\n\t/go/src/adaptercore/openolt_flowmgr.go:1465\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOltFlowMgr).RemoveFlow\n\t/go/src/adaptercore/openolt_flowmgr.go:1503\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*DeviceHandler).UpdateFlowsIncrementally\n\t/go/src/adaptercore/device_handler.go:1086\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOLT).Update_flows_incrementally\n\t/go/src/adaptercore/openolt.go:284\ngithub.com/opencord/voltha-lib-go/v2/pkg/adapters/common.(*RequestHandlerProxy).Update_flows_incrementally\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/adapters/common/request_handler.go:398\nreflect.Value.call\n\t/usr/local/go/src/reflect/value.go:447\nreflect.Value.Call\n\t/usr/local/go/src/reflect/value.go:308\ngithub.com/opencord/voltha-lib-go/v2/pkg/kafka.CallFuncByName\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/kafka/kafka_inter_container_library.go:601\ngithub.com/opencord/voltha-lib-go/v2/pkg/kafka.(*InterContainerProxy).handleMessage\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/kafka/kafka_inter_container_library.go:660"
}
{
  "level": "error",
  "ts": "2019-12-18T21:34:38.719Z",
  "msg": "error processing delete tcont towards onu",
  "instanceId": "adapter-open-olt-6c87bfdcd8-v2qlz",
  "caller": "openolt_flowmgr.clearResources:1403",
  "pon": 0,
  "onuID": 1,
  "uniID": 1,
  "allocId": 1025,
  "stacktrace": "github.com/opencord/voltha-lib-go/v2/pkg/log.Errorw\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/log/log.go:721\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOltFlowMgr).clearResources\n\t/go/src/adaptercore/openolt_flowmgr.go:1403\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOltFlowMgr).clearFlowFromResourceManager\n\t/go/src/adaptercore/openolt_flowmgr.go:1465\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOltFlowMgr).RemoveFlow\n\t/go/src/adaptercore/openolt_flowmgr.go:1503\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*DeviceHandler).UpdateFlowsIncrementally\n\t/go/src/adaptercore/device_handler.go:1086\ngithub.com/opencord/voltha-openolt-adapter/adaptercore.(*OpenOLT).Update_flows_incrementally\n\t/go/src/adaptercore/openolt.go:284\ngithub.com/opencord/voltha-lib-go/v2/pkg/adapters/common.(*RequestHandlerProxy).Update_flows_incrementally\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/adapters/common/request_handler.go:398\nreflect.Value.call\n\t/usr/local/go/src/reflect/value.go:447\nreflect.Value.Call\n\t/usr/local/go/src/reflect/value.go:308\ngithub.com/opencord/voltha-lib-go/v2/pkg/kafka.CallFuncByName\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/kafka/kafka_inter_container_library.go:601\ngithub.com/opencord/voltha-lib-go/v2/pkg/kafka.(*InterContainerProxy).handleMessage\n\t/go/src/vendor/github.com/opencord/voltha-lib-go/v2/pkg/kafka/kafka_inter_container_library.go:660"
}