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

gui/boosterView.py

@@ -85,6 +85,11 @@ class BoosterView(d.Display):
         event.Skip()
 
     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:
             self.DeleteAllItems()
@@ -92,9 +97,6 @@ class BoosterView(d.Display):
             event.Skip()
             return
 
-        sFit = service.Fit.getInstance()
-        fit = sFit.getFit(event.fitID)
-
         self.origional = fit.boosters if fit is not None else None
         self.boosters = stuff = fit.boosters[:] if fit is not None else None