Hi everybody, I'd like to know your opinion about bug 159232: https://bugs.launchpad.net/zope3/+bug/159232 It's about a IMHO wrong test in ItemDisplayWidget of the zope.app.form package. I've made a patch (the second one in that bug) with a test that exercise the bug and a fix for it but I'm not sure about the correctness of it and that's why I ask you for review. Here is the problem: - When the values of a vocabulary are containers and they are *empty* the __call__ method of ItemDisplayWidget will return an empty string for them, instead of its matching token. There are two possible solutions: A) Change the test inside the __call__ method so when checking the result of self._getFormValue() it explicitily checks for the empty string B) Do the conversion from the vocabulary value to a form value in a custom _getFormValue method in the ItemDisplayWidget class What do you guys think? best regards, Lorenzo