@abc.abstractproperty
    def uuid(self):
        raise NotImplementedError
The cover photo is consider set if it is a non empty dict.
dataset/ETHPy150Open adafruit/Adafruit_Python_BluefruitLE/Adafruit_BluefruitLE/interfaces/gatt.py/GattService.uuid--crossover with--dataset/ETHPy150Open viewfinderco/viewfinder/backend/db/viewpoint.py/Viewpoint.IsCoverPhotoSet