def get_crimes_no_location(self, force, date=None, category=None):
        """
        Get crimes with no location for a force. Uses the crimes-no-location_
        API call.

        .. _crimes-no-location:
            https://data.police.uk/docs/method/crimes-no-location/

        :rtype: list
        :param force: The force to get no-location crimes for.
        :type force: str or Force
        :param date: The month in which the crimes were reported in the format
                    ``YYYY-MM`` (the latest date is used if ``None``).
        :type date: str or None
        :param category: The category of the crimes to filter by (either by ID
                         or CrimeCategory object)
        :type category: str or CrimeCategory
        :return: A ``list`` of :class:`crime.NoLocationCrime` objects which
                 were reported in the given month, by the specified force, but
                 which don't have a location.
        """

        if not isinstance(force, Force):
            force = Force(self, id=force)

        if isinstance(category, CrimeCategory):
            category = category.id

        kwargs = {
            'force': force.id,
            'category': category or 'all-crime',
        }
        crimes = []
        if date is not None:
            kwargs['date'] = date
        for c in self.service.request('GET', 'crimes-no-location', **kwargs):
            crimes.append(NoLocationCrime(self, data=c))
        return crimes
Get crimes with no location for a force. Uses the crimes-no-location_
        API call.

        .. _crimes-no-location:
            https://data.police.uk/docs/method/crimes-no-location/

        :rtype: list
        :param force: The force to get no-location crimes for.
        :type force: str or Force
        :param date: The month in which the crimes were reported in the format
                    ``YYYY-MM`` (the latest date is used if ``None``).
        :type date: str or None
        :param category: The category of the crimes to filter by (either by ID
                         or CrimeCategory object)
        :type category: str or CrimeCategory
        :return: A ``list`` of :class:`crime.NoLocationCrime` objects which
                 were reported in the given month, by the specified force, but
                 which don't have a location.