In an edit box control, I've selected the comma as the multipleSeparator and set the attribute multipleTrim = true.  This field is also required.  When I go to test the form, having selected an entry for the multi-value field, a comma is automatically appended to the selected value.  However when I click Submit, the validation fails as if there's no value in the field because of the trailing comma.  If I remove trailing comma, the validation passes.  I don't want the user to have to remove the comma.  Is there an easy way to remove, empty values caused by the user or by the inherent design of XPages, without having to write code to strip them out before validation?