Render error message when selection mismatch

[jarrodek]

When selectedShape and selectedShapeType is set but the type doesn't correspond to the node that is selected the console should render a view that says "Page does not exist" with some kind of explanation.

The page you are trying to render is no longer available. It is possible that the API model had changed and the requested (operation/endpoint/type/security scheme) no longer exists or has different location. Use the navigation to select a document.