Adding missing if condition to effects

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_Main/src/de/steamwar/fightsystem/kit/Kit.java

@@ -58,7 +58,8 @@ public class Kit {
         if(armor != null)
             player.getInventory().setArmorContents(armor);
         player.updateInventory();
-        player.addPotionEffects(effects);
+        if(effects != null)
+            player.addPotionEffects(effects);
     }
 
     void saveKit(ConfigurationSection section){