Disable fit add on pages based on context (ship vs citadel)

gui/droneView.py

@@ -159,6 +159,10 @@ class DroneView(d.Display):
                 drone.item.name)
 
     def fitChanged(self, event):
+        sFit = service.Fit.getInstance()
+        fit = sFit.getFit(event.fitID)
+
+        self.Parent.Parent.DisablePage(self, not fit or fit.isStructure)
 
         #Clear list and get out if current fitId is None
         if event.fitID is None and self.lastFitId is not None:
@@ -167,9 +171,6 @@ class DroneView(d.Display):
             event.Skip()
             return
 
-        sFit = service.Fit.getInstance()
-        fit = sFit.getFit(event.fitID)
-
         self.original = fit.drones if fit is not None else None
         self.drones = stuff = fit.drones[:] if fit is not None else None