The Details view does not react when its input is deselected

[pcdavid]

Steps to reproduce

1. Open a project. Initially there is no element selected, and the Details view correctly says so: "No object selected".
2. Select an element in the Explorer view.
3. Its details are shown in the Details view, and the onboard area is updated too depending on the selected element's type.
4. Deselect the element in the Explorer (Ctrl-click).
5. Now the workbench selection is empty as it was in step 1. The onboard area is updated, but the Details view continues to show the details of the previously selected element. It should be back to the "No object selected" state.

Capture.video.du.2024-12-13.15-06-31.mp4

[pcdavid]

Note that in such a state the Details view is half-functional: it can send mutations when the user interacts with the widgets but will not receive the new values:

Capture.video.du.2024-12-13.17-31-28.mp4

Worse, if the displayed element is deleted by another user, the form stays visible but this time interactions with it completely fail.