Hi, 

I'm working on an option strategy. noticed option chain is missing for few days for Ticket = Ph

Am I missing any thing?

//Intialize SetStartDate(2019, 01, 3); SetEndDate(2019, 01,30); SetCash(1000000); AddEquity(ticker, Resolution.Minute); var option = AddOption(ticker, Resolution.Minute); option.SetFilter(u => u.Strikes(-7, 7).Expiration(TimeSpan.FromDays(45), TimeSpan.FromDays(90))); //OnData OptionChain callChain; if (slice.OptionChains.TryGetValue(stock.OptionSymbol, out callChain)) {   // data missing for few dates like Jan 11,14 }