Add default value for Exchange security types (#6032)
Add default value for Exchange security types (#6032)


AlexCatarino/Lean,AlexCatarino/Lean,QuantConnect/Lean,QuantConnect/Lean,JKarathiya/Lean,QuantConnect/Lean,QuantConnect/Lean,jameschch/Lean,AlexCatarino/Lean,AlexCatarino/Lean,JKarathiya/Lean,JKarathiya/Lean,jameschch/Lean,jameschch/Lean,jameschch/Lean,jameschch/Lean,JKarathiya/Lean