Wrapper for .create() with cleanup.

        :param original:
        :param size:
        :param crop:
        :param options:
        :return: An image object

def get_thumbnail(self, original, size, crop, options):
        """
        Wrapper for .create() with cleanup.

        :param original:
        :param size:
        :param crop:
        :param options:
        :return: An image object
        """
        try:
            image = self.create(original, size, crop, options)
        except ThumbnailError:
            image = None
        finally:
            self.cleanup(original)
        return image