[Zope] Is this a bug with multiple selection lists?

[Michiel Toneman]

Hi all,

I encountered some strange behaviour with multiple selection 
lists in the properties form. If I deselect all items and 
submit the properties I get the following error:

Error Type: TypeError
Error Value: string member test needs char left operand

Is there a workaround for this? What's worse is that I need 
to use the "undo" function to get rid of this, because the
properties tab doesn't work any more :(

Greetings,

Michiel Toneman

--
From a Sun Microsystems bug report (#4102680):
 "Workaround: don't pound on the mouse like a wild monkey."