Checkmk Werk 10870: Tags: Fix exception when renaming an existing tag choice

ID: 10870 Title: Tags: Fix exception when renaming an existing tag choice Component: WATO Level: 1 Class: Bug fix Version: 1.7.0i1 When editing the ID of a tag choice that is referenced by some other object, an exception like this could occur in previous versions: "TypeError: 'OperationReplaceGroupedTags' object has no attribute '__getitem__'".