fixed SelectedItem when no item

Assets/Scripts/Inventory.cs

@@ -35,6 +35,15 @@ public class Inventory : ItemStorage {
         base.AddItem(item, amount);
     }
 
+    public override void RemoveItem(Item item, int amount)
+    {
+        base.RemoveItem(item, amount);
+        if (!items.ContainsKey(item))
+        {
+            PlayerController.instance.DeselectItem();
+        }
+    }
+
     public void SellItem(Item item, int amount) {
         PlayerController.instance.ChangeMoney(item.SellPrice);
         Shop.instance.AddItem(item, amount);

Assets/Scripts/PlayerController.cs

@@ -51,6 +51,12 @@ public class PlayerController : MonoBehaviour {
         }
     }
 
+    public void DeselectItem()
+    {
+        _selectedItem = null;
+        Cursor.SetCursor(null, Vector2.zero, CursorMode.Auto);
+    }
+
     public UsableItem GetSelectedItem() {
         return _selectedItem;
     }

Assets/Scripts/Tiles/FarmlandTile.cs

@@ -20,6 +20,8 @@ namespace Tiles
         public override BaseTile Clicked(UsableItem usable)
         {
             BaseTile rv = null;
+            if (usable != null)
+            {
                 base.Clicked(usable);
                 _crop.Clicked(usable);
 
@@ -27,6 +29,7 @@ namespace Tiles
                 {
                     rv = new GrassTile(_gameObject);
                 }
+            }
 
             return rv;
         }