def match(self, item):
        """ Return True if filter matches item.
        """
        if getattr(item, self._name) is None:
            # Never match "N/A" items, except when "-0" was specified
            return False if self._value else self._cmp(-1, 0)
        else:
            return super(DurationFilter, self).match(item)
Return True if filter matches item.