Test if value is enumset

src/engine/objects/ItemTemplate.java

@@ -493,7 +493,12 @@ public class ItemTemplate {
                 rune_dsc = (String) jsonObject.get("rune_dsc");
                 rune_fx_txt = (String) jsonObject.get("rune_fx_txt");
                 rune_group_tactics = ((Long) jsonObject.get("rune_group_tactics")).intValue();
-                EnumSet<Enum.MobBehaviourType> tactics = Enum.fromLong(rune_group_tactics, Enum.MobBehaviourType.class);
+
+                EnumSet<Enum.MobBehaviourType> tactics = EnumSet.noneOf(Enum.MobBehaviourType.class);
+
+                if (rune_group_tactics != 0)
+                    tactics.addAll(Enum.fromLong(rune_group_tactics, Enum.MobBehaviourType.class));
+
                 rune_group_role_set = ((Long) jsonObject.get("rune_group_role_set")).intValue();
 
                 JSONArray enemy_types_json = (JSONArray) jsonObject.get("rune_enemy_monster_types");