Conditional Statements

Instead of creating two conditional statements for each that separate whether it can or cannot, you can use one condition statement.

{{#if:{{{Variable|}}}|True text|False text}}

{{#if:{{{CanEgo|}}}|*Can be made into a spirit weapon.|*Cannot be made into a spirit weapon.}}
{{#if:{{{HasSpecialUpgrade|}}}|*Special Upgrade is available.|*Cannot receive Special Upgrade.}}

If the parameter is null will it default to false?

Yes.