Add lines for any waiting fields that can be completed now.

def get_waiting_list(self, force=False):
        """ Add lines for any waiting fields that can be completed now. """

        code_lines = []
        skip_autofield = self.options['skip_autofield']

        # Process normal fields
        for field in list(self.waiting_list):
            try:
                # Find the value, add the line, remove from waiting list and move on
                value = get_attribute_value(self.instance, field, self.context, force=force, skip_autofield=skip_autofield)
                code_lines.append('%s.%s = %s' % (self.variable_name, field.name, value))
                self.waiting_list.remove(field)
            except SkipValue:
                # Remove from the waiting list and move on
                self.waiting_list.remove(field)
                continue
            except DoLater:
                # Move on, maybe next time
                continue

        return code_lines