association-select ignores placeholder value

[mredl]

In rc7 of aurelia-orm, the association-select ignores a custom placeholder value. i have set following properties, but in the final html code always '- select a value -' gets rendered as placeholder.

<association-select property="name" value.bind="currentStudioId" repository.bind="studioRepo" selectablePlaceholder="true" criteria.bind='{where:{isAvailable:{"==":true}}}' placeholderText="Select Studio"> </association-select>

[doktordirk]

see #213