Edge case fix

Fixed an edge case where there were no cards left and it caused an error

3D blobici/Assets/Scripts/Cards/CardManager.cs

@@ -64,7 +64,10 @@ public class CardManager : MonoBehaviour
         Debug.Log($"Available cards: {string.Join(", ", availableCards.Select(x => x.Skill))}");
         Debug.Log($"Unlocked skills: {string.Join(", ", unlockedSkills)}");
 
-        
+
+        if (shuffled.Count <= 0)
+            return;
+
         float step = Screen.width / shuffled.Count;
         float pos = step - Screen.width / (2*shuffled.Count);