[UPD] In create method, use name field unless name_get

In create method, use name unless name_get to define res_name value.
In account.voucher model, the name_get return the amount, and we don't want this, we would like to get the name field.
I would check with corresponding defenses (try):

* First name_get
* Then name
* After this, "model_name,id" (as reference fields do).