Can you double check that it is actually the default value, and not a trailing empty line (I'm guessing that you are posting to 'addTeacher' from a form with a control like: '<textarea name="teachers:lines">...').
The complete content of the form is below, and it is very simple. I am very certain that it is not the problem. I have also checked that it isn't an extra checkbox that has been sneaking in there.
I solved the problem by removing the line with the default value in the form, and changing the action method to::
def editTeachersAction(self, teachers=None, REQUEST=None): "Code" if not teachers: teachers = 
Which is a better way to do it anyway. But that still leaves the bug in the form handling of Zope.
regards Max M
<div class="primary_h1">Undervisere tilknyttet uv-forløbet</div> <br>
<form action="editTeachersAction" method="post" name="form" tal:define="allTeachers here/users/getAllTeachers">
<input type="hidden" name="teachers:list:default" value="">
<span tal:repeat="teacher python:here.uddan_teacher.getSmartList(here, allTeachers)">
<input type="checkbox" name="teachers:list" value="path"
tal:attributes="value teacher/path; checked teacher/selected">
<br> <br> <input type="submit" value=" Gem "> </form>
E.g, change the 'teachers:list:default' value to some other string, and see if that value propagates.
Either way, as a robustness measure I would recommend adding some input checking to 'addTeacher', e.g.:
def addTeacher( self, teachers ):
""" Add one or more teachers. """ teachers = filter( None, teachers ) # strip empty lines # your processing here
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