Fix renderAuthority being empty after device rotation

In theory, renderAuthority should never be empty if a node is attached.
In practice, some elements can still be composed even when they are
already detached. In this edge case we will now simply return false.

Bug: 383345762
Test: manual verification
Flag: com.android.systemui.scene_container
Change-Id: I2c703d82fbb21b2f13ff29505642cb630169277c