IncludedInPage with resource binding to _control property doesn't work

[tomasherceg]

I've tried markup controls with the @property directive, but I am getting NullReferenceException in Render method when the property is passed to IncludedInPage via resource binding on _control.SomeProperty.

@property bool ShowDescription

<p IncludeInPage="{resource: _control.ShowDescription}">test</p>

The exception: dotvvm-error-NullReferenceException.zip

[exyi]

It happens because the property isn't assigned and it's default value is null. I'll fix the default value, and IMHO it would make sense to make properties without defined default required.