Merge "Allow sensors list to be empty" into udc-dev

        mSensors = mSensorServer->getSensorList(mOpPackageName);

        size_t count = mSensors.size();

        if (count == 0) {

            ALOGE("Failed to get Sensor list");

            mSensorServer.clear();

            return UNKNOWN_ERROR;

        }

        // If count is 0, mSensorList will be non-null. This is old

        // existing behavior and callers expect this.

        mSensorList =

                static_cast<Sensor const**>(malloc(count * sizeof(Sensor*)));

        LOG_ALWAYS_FATAL_IF(mSensorList == nullptr, "mSensorList NULL");