Today for the RIC: LCO5500L1 a market quote was briefly visible but then the market disappeared (or whoever showed the market on the exchange, pulled it). However we did not receive a 0 bid/ask quote for that RIC via the RFA API. Can someone please confirm why that wasn't the case ? Or how do we deal with such scenarios. Our application does not want to show a market that does not exist on the exchange anymore. However the RFA API does not send us a zero bid/ask