non integer cart item's quantity bug workaround

[ddavout]

When you enter a non integer value for the number of items in the cart
listing you have got an exception.
So I  try to have my own class  ShoppingCartListing  :

class ShoppingCartListing(PGP_ShoppingCartListing):

   # to change templates
   # to use my cartformatter
   # to hopefully patch handle_update
   #  quantity integer http://code.google.com/p/getpaid/issues/detail?id=255
    template = ZopeTwoPageTemplateFile('templates/cart-listing.pt')
    formatter_factory = CartFormatter

    @form.action(_("Update"), condition="isNotEmpty")
    def handle_update(self, action, data):
        try:
            data = self.quantity_column.input(self.container.values(),
self.request)
        except: # put everything back
            self.form_reset = True
            for i in self.request.form.keys():
                self.request.form.pop(i)
        self.form_reset = True
        self.quantity_column.update(self.container.values(), data)
        for item_id in self.container:
            if self.container[item_id].quantity == 0: # remove everything
                del self.container[item_id]
It works ( although not for the negative numbers yet  )
but
ONLY if I change in the class FieldEditColumn(Column), the method input
from
           ......
            if widget.hasInput():
                try:
                    data[id] = widget.getInputValue()
                except WidgetInputError, v:
                    raise errors.append(v)
           .....
to
            ......
            if widget.hasInput():
                try:
                    data[id] = widget.getInputValue()
                except :#WidgetInputError, v:
                    raise #errors.append(v)
            .......
Some advice needed....

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