Only force send callbacks if they are registered am: 109ad715

status_t TransactionCompletedThread::finalizePendingCallbackHandles(

        const std::deque<sp<CallbackHandle>>& handles) {

    if (handles.empty()) {

        return NO_ERROR;

    }

    std::lock_guard lock(mMutex);

    if (!mRunning) {

        ALOGE("cannot add presented callback handle because the callback thread isn't running");