Return undefined for candles orderbookMidPrice instead of hitting OrderbookCache in Redis #3874

Job	Run time
check-build-auxo	4m 29s
check-build-bazooka	4m 52s
call-build-ecs-service-comlink / (comlink) Check docker image build	5m 43s
call-build-ecs-service-ender / (ender) Check docker image build	4m 18s
call-build-ecs-service-roundtable / (roundtable) Check docker image build	4m 13s
call-build-ecs-service-socks / (socks) Check docker image build	4m 15s
call-build-ecs-service-vulcan / (vulcan) Check docker image build	4m 19s
	32m 9s

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