Fix there's no padding between time and date in large weather clock in AOD

The reason is that both bcSmartspace and aodIconContainer may be gone
when use them as the barrier.

Flag: com.android.systemui.migrate_clocks_to_blueprint
Bug: 346748432
Test: manually test locking screen with power button, observe there's
padding when there's no notifications or smartspace

Change-Id: I6e298ed2a531bf2d156e26538ffcaab09fb399b0