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Drop down list errors if initialised from a SELECT element that has nothing selected

If a DropDownList component is initialised from a select element and no options are selected (i.e. the selectedIndex property on the select element is -1) then it errors.

I've modified your documentation example of initialising a DropDownList from a select element to set selectedIndex to -1 on the select element prior to initialisation and it triggers the error - see here.

My guess is that the "else if" clause that erroring line is under just needs to also exclude running that small block of code if this.element.selectedIndex is -1 (as I think that would leave the value on the component unset, mirroring the select element's lack of value set).