fix killing nonexistent sprites

projects/nat-flixel-desktop-playground/source/EntrySpriteSystem.kiss

@@ -19,9 +19,11 @@
                     (dictSet sprites e.id sprite)))
         ->[archive e &opt ui]
             {
-                (.kill (dictGet sprites e.id))
-                (playState.entryGroup.remove (dictGet sprites e.id))
-                (sprites.remove e.id)
+                (whenLet [sprite (dictGet sprites e.id)]
+                    (sprite.kill)
+                    (playState.entryGroup.remove sprite)
+                    (sprites.remove e.id))
+                
                 // When an Entry is hidden, we can bet the user doesn't want it selected anymore
                 (controller.DeSelectEntry e)
             }))

projects/nat-flixel-desktop-playground/source/PlayState.hx

@@ -19,7 +19,6 @@ import flixel.addons.plugin.FlxMouseControl;
 import flixel.input.mouse.FlxMouseEventManager;
 using StringTools;
 using kiss_flixel.CameraTools;
-import kiss_flixel.KeyShortcutWindow;
 import kiss_tools.KeyShortcutHandler;
 import kiss_tools.FlxKeyShortcutHandler;
 import nat.systems.PlaygroundSystem;