acts_as_translatable

I'm hoping someone can help me with this.

The default behavior for acts_as_translatable is to return the
original field if it can't find a translation, but in this case I want
it to return a NULL value for untranslated fields.

The reason is that I have textareas that are supposed to be empty if
there is no translation present.

I was thinking this would be quite easy since it is able to return the
untranslated fields.