As commands now commit/recalc even in case of failure (as they do not know about exact reason of failure and we're not sure if rollback was succeeded), do not run them for every item added via double-click

gui/builtinViews/fittingView.py

@@ -357,8 +357,11 @@ class FittingView(d.Display):
             itemID = event.itemID
             fitID = self.activeFitID
             if fitID is not None:
-                sFit = Fit.getInstance()
-                if sFit.isAmmo(itemID):
+                item = Market.getInstance().getItem(event.itemID, eager='group.category')
+                if item is None or not (item.isModule or item.isSubsystem):
+                    event.Skip()
+                    return
+                if Fit.getInstance().isAmmo(itemID):
                     # If we've selected ammo, then apply to the selected module(s)
                     modules = []
                     sel = self.GetFirstSelected()