OrderCommand null reference because no data

[Martin-Molinero]

Expected Behavior

• Order is placed or rejected correctly

Actual Behavior

2022-07-27T20:40:24.8865635Z ERROR:: BacktestingBrokerage.Scan():  System.NullReferenceException: Object reference not set to an instance of an object.
   at QuantConnect.Orders.Fills.EquityFillModel.IsExchangeOpen(Security asset, Boolean isExtendedMarketHours) in Lean/Common/Orders/Fills/EquityFillModel.cs:line 1033
   at QuantConnect.Orders.Fills.EquityFillModel.MarketFill(Security asset, MarketOrder order) in Lean/Common/Orders/Fills/EquityFillModel.cs:line 236
   at QuantConnect.Orders.Fills.EquityFillModel.Fill(FillModelParameters parameters) in Lean/Common/Orders/Fills/EquityFillModel.cs:line 71
   at QuantConnect.Brokerages.Backtesting.BacktestingBrokerage.Scan() in Lean/Brokerages/Backtesting/BacktestingBrokerage.cs:line 379

Potential Solution

• Check for null data point in the EquityFillModel
• The OrderCommand could also run pre submittion order checks, like done by the QCAlgorithm layer

Reproducing the Problem

• Deploy Live
• Add TSLA
• Placed order for TSLA
• If it didn't have any data yet null referenced at https://github.com/QuantConnect/Lean/blob/master/Common/Orders/Fills/EquityFillModel.cs#L1033 currentBar being null

System Information

N/A

Checklist

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