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error while pulling reservations by server from agent

The problem appears in subsequent fetch of reservations in case when kea-dhcp4 daemon is stopped.

ERRO[2020-05-31 11:14:47]             host.go:88    error occurred while fetching hosts from app {ID:1 CreatedAt:2020-05-31 09:14:02.279493 +0000 UTC MachineID:1 Machine:0xc000844160 Type:kea Active:false Meta:{Version:1.7.3 ExtendedVersion:} AccessPoints:[0xc0009b20f0] Daemons:[0xc0007c2fc0 0xc0007c3080 0xc0007c3140 0xc0007c3200]}: error returned by Kea in response to reservation-get-page command
isc.org/stork/server/apps/kea.(*HostDetectionIterator).sendReservationGetPage
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:253
isc.org/stork/server/apps/kea.(*HostDetectionIterator).DetectHostsPageFromHostCmds
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:366
isc.org/stork/server/apps/kea.updateHostsFromHostCmds
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:546
isc.org/stork/server/apps/kea.(*HostsPuller).pullData
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:85
isc.org/stork/server/agentcomm.(*PeriodicPuller).pullerLoop
	/home/godfryd/isc/repos/stork-dashb/backend/server/agentcomm/puller.go:93
runtime.goexit
	/home/godfryd/isc/repos/stork-dashb/tools/1.13.5/go/src/runtime/asm_amd64.s:1357
problem with sending reservation-get-page command upon attempt to detect host reservations over the host_cmds hooks library 
WARN[2020-05-31 11:14:47]      statspuller.go:49    missing key total-addreses in LocalSubnet 15 stats 
INFO[2020-05-31 11:14:47]             host.go:101   completed pulling hosts from Kea apps: 0/1 succeeded 
ERRO[2020-05-31 11:14:47]           puller.go:95    errors were encountered while pulling data from Kea apps: error returned by Kea in response to reservation-get-page command
isc.org/stork/server/apps/kea.(*HostDetectionIterator).sendReservationGetPage
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:253
isc.org/stork/server/apps/kea.(*HostDetectionIterator).DetectHostsPageFromHostCmds
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:366
isc.org/stork/server/apps/kea.updateHostsFromHostCmds
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:546
isc.org/stork/server/apps/kea.(*HostsPuller).pullData
	/home/godfryd/isc/repos/stork-dashb/backend/server/apps/kea/host.go:85
isc.org/stork/server/agentcomm.(*PeriodicPuller).pullerLoop
	/home/godfryd/isc/repos/stork-dashb/backend/server/agentcomm/puller.go:93
runtime.goexit
	/home/godfryd/isc/repos/stork-dashb/tools/1.13.5/go/src/runtime/asm_amd64.s:1357
problem with sending reservation-get-page command upon attempt to detect host reservations over the host_cmds hooks library