Checkmk Werk 13658: Fix validation of ID while creating or cloning visuals and pagetypes

ID: 13658 Title: Fix validation of ID while creating or cloning visuals and pagetypes Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 If you cloned an existing visual, e.g. reports or bookmarks, it was possible to save the new visual with an already existing ID, overwriting the already existing visual. Pagetypes like topics could be created with an existing ID, while cloning was not possible with an existing ID.