Disable View -> Spawn entries until these functionalities become available

The menu entries View -> Spawn Table / Spawn Diagram / Spawn Pole figure are always enabled, even if these functionalities are not available. It is necessary to load data, fit at least one peak and create a table, diagram or pole figure before these become available. I suggest that these menu entries should be disabled "grayed out" until these functionalities become available. Alternatively these entries could also be removed from menu these buttons are also featured on their respective tabs.