Merge "Check for mIdleTimer instead of fatal log" into main

        const auto& idleScreenConfigOpt = getCurrentPolicyLocked()->idleScreenConfigOpt;

        if (idleScreenConfigOpt != oldPolicy.idleScreenConfigOpt) {

            if (!idleScreenConfigOpt.has_value()) {

                if (mIdleTimer) {

                    // fallback to legacy timer if existed, otherwise pause the old timer

                LOG_ALWAYS_FATAL_IF(!mIdleTimer);

                    if (mConfig.legacyIdleTimerTimeout > 0ms) {

                        mIdleTimer->setInterval(mConfig.legacyIdleTimerTimeout);

                        mIdleTimer->resume();

                    } else {

                        mIdleTimer->pause();

                    }

                }

            } else if (idleScreenConfigOpt->timeoutMillis > 0) {

                // create a new timer or reconfigure

                const auto timeout = std::chrono::milliseconds{idleScreenConfigOpt->timeoutMillis};