Simply annotating a property with @NgAttr('foo') causes the setter to be called with null

[codelogic]

@NgAttr('a-property')
  set aProperty(bool value) {
    if(value == null) throw "THIS SHOULD NOT HAPPEN";
  }
  bool get aProperty => false;

This is problematic when you want to have a default value for a property, but still want it to be settable.

[mhevery]

@markovuksanovic We should only call the setter if the attribute a-property has been defined on the element.