Hide "Add > Workspace" top menu when the user does not have view rights on the WorksapceManager.CreateNewWorkspace page

The current way of handling the right of users to create workspaces is to limit their access to the main wiki`s WorkspaceManager.CreateNewWorkspace page.

However, if a user does not have view access to the page, it means that he is not able to create workspaces and the create workspace option in the top menu should not be visible.