Deleting Edge layer from a geopackage makes it impossible to open in QGIS anymore

[deltamarnix]

• Open QGIS and ensure that the Ribasim plugin is installed and enabled.
• Open the application via the Ribasim button on the QGIS toolbar: Ribasim panel opens.
• Press the "New" button in the Model tab: file navigation window pops up.
• Fill in a name ("test1").
• Press OK: A toml and database file are created on the given location.
• Press the "Edge" layer in the Model tab, press "Remove from Dataset": Popup shows "Deleting: Edge".
• Press "Yes": "Edge" layer is removed from Layers panel and from Model tab.
• Press the "Open" button in the Model tab: file navigation window pops up.
• Open "test1.toml": Throws error, because it cannot find "Edge anymore".

Expected: Not such a big crash, but more like a validation error. Or we should not allow deletion of "Edge" and "Node" layers from the database.

[Huite]

Indeed, it shouldn't be possible to delete the Node and Edge layers.

In QGIS-Tim, I have two mandatory layers as well, they are always removed from the deletion selection:

        # Collect the selected items
        selection = self.selectedItems()
        selection = [
            item
            for item in selection
            if not isinstance(item.element, (Aquifer, Domain))
        ]

This is currently silent though, you probably want a an info message that mentions that these layers cannot be deleted.