Deleting a nested table throws an error

[yanmariomenev]

Describe the bug
If the user attempts to delete a nested table using the delete table tool, an error message stating "Invalid content for node type table" will be displayed.

To Reproduce

1. Open - https://stackblitz.com/edit/angular-ff53wj?file=src%2Fapp%2Fapp.component.ts
2. Create a table and then use the tool to create another one inside the parent and click the delete table tool to remove the newly created child table.