Validation not working (throws error 500) when data source for bs:FormControlComboBox contains value "null".

[kostyio]

Hello,

I am using bs:FormControlComboBox in a .dothtml page, where as a data source is used an ICollection filled with values from enum + value "null". In the view model is used a model which inherits "IValidatableObject" and has the Validate method implemented. If the validation of this object fails, the page throws error 500 (Unhandled exception), instead of highlighting the required field to the user. The bug "dissapears" (the validation works as it should and highlights the required fields) if the value "null" is removed from the data source of the bs:FormControlComboBox.

Bug reproduction project : https://github.com/kostyio/NullablePropertyDotVVMValidatorBug