Safe point triggers on removing folder from the read-only shared database

Scenario to reproduce:

1. Connect to a read-only shared database (e.g. to the UGENE public database).
2. Open any document.
3. Select the document and any folder in the database in the project view.
4. Remove selected items via "del" key.
   Expected state: the document is removed, the folder is not removed.
   Current state: safe point triggers on the folder removing.

Also check UGENE behavior with objects in the database.