fix not open skill UI when click on empty quick bar slot

Assets/PerfectWorld/Scripts/Skills/CECSCSkill.cs

@@ -58,6 +58,7 @@ namespace BrewMonster
         }
         public CECSkill GetSkill() { return m_pSkill; }
         public void SetSkill(CECSkill pSkill) { m_pSkill = pSkill; }
+        public override string GetDesc() { return m_pSkill.GetSkillID().ToString(); }
 
     }
 }

Assets/PerfectWorld/Scripts/UI/Dialogs/CDlgSkillAction.cs

@@ -13,17 +13,20 @@ namespace BrewMonster
         [SerializeField] private SkillUI skillUI;
 
         bool m_bOpenAction;
-        bool m_bReceivedNCPGreeting;	// ÊÇ·ñÊÕµ½ÁËNPCµÄGreeting
+        bool m_bReceivedNCPGreeting;	// �Ƿ��յ���NPC��Greeting
 
         public override void Awake()
         {
             base.Awake();
             uiSkillButton.onClick.RemoveAllListeners();
             uiSkillButton.onClick.AddListener(OnSkillButtonClicked);
-            EventBus.Unsubscribe<OpenSkillUIEvent>(OnOpenSkillUIEvent);
             EventBus.Subscribe<OpenSkillUIEvent>(OnOpenSkillUIEvent);
         }
-
+        public void OnDestroy()
+        {
+            EventBus.Unsubscribe<OpenSkillUIEvent>(OnOpenSkillUIEvent);
+        }
+        
         private void OnOpenSkillUIEvent(OpenSkillUIEvent @event)
         {
             TryOpenDialog(false);
@@ -35,6 +38,10 @@ namespace BrewMonster
         }
         public void TryOpenDialog(bool bAction)
         {
+            if(skillUI == null)
+            {
+                return;
+            }
             var boolll = skillUI.gameObject.activeInHierarchy;
             if (boolll)
             {