Animation Rigging toolbar dropdown options do nothing and do not throw any warning or informational popup when pressed with no GameObject selected

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Install the Animation Rigging package (com.unity.animation.rigging)
3. Make sure no GameObject is selected in the Hierarchy window
4. Open the Animation Rigging dropdown in the toolbar
5. Select any option
6. Observe the Editor

Actual results: Animation Rigging toolbar dropdown options do nothing and do not throw any warning or informational popup when pressed with no GameObject selected

Expected results: A warning or a popup should appear letting the user know why nothing is happening, or the dropdown options are greyed out/disabled when conditions are not met

Reproducible with versions: 1.3.1, 1.4.0 (6000.0.62f1, 6000.2.12f1, 6000.3.0f1, 6000.4.0a5, 6000.5.0a1)

Tested on (OS): MacOS Silicon Tahoe 26.0.1, Windows 11

Notes:

• Other toolbar dropdowns have options disabled/greyed out in these situations