Fix photo bug (#92)

Author: marlenaklein-msft

unity/acsShowcase/Assets/Prefabs/Users/MainUser.prefab

@@ -224,6 +224,7 @@ MonoBehaviour:
   - {fileID: 2800000, guid: 31c743e644772c44492a5100b330ae6d, type: 3}
   - {fileID: 2800000, guid: d2086432f49773e4abf53fc65626554c, type: 3}
   pressableButton: {fileID: 0}
+  defaultIconTexture: {fileID: 2800000, guid: a7c55f177c2da3c48ade207a599e9ddd, type: 3}
 --- !u!114 &7152402777604146220
 MonoBehaviour:
   m_ObjectHideFlags: 0

unity/acsShowcase/Assets/Scripts/Graph/PhotoGetter.cs

@@ -67,6 +67,7 @@ protected override void OnAuthenticated()
         #region Private Functions
         private async void UpdateProfilesWorkerAsync()
         {
+            Photo = null;
             byte[] data = null;
             string token = Token;
             if (!string.IsNullOrEmpty(token))

unity/acsShowcase/Assets/Scripts/UI/UserObject.cs

@@ -27,7 +27,9 @@ [SerializeField] [Tooltip("The texture image of the presence")]
     private List<Texture2D> presences;
     [SerializeField] [Tooltip("The pressable button of this user object")]
     private PressableButton pressableButton;
-    
+    [SerializeField] [Tooltip("The default icon texture")]
+    private Texture defaultIconTexture;
+
     /// <summary>
     /// list of background color 
     /// </summary>
@@ -98,11 +100,6 @@ public PageType UserObjectPageType
     /// </summary>
     private PresenceAvailability presenceAvail;
 
-    
-    /// <summary>
-    /// default icon texture 
-    /// </summary>
-    private Texture defaultIconTexture;
 
     /// <summary>
     /// user presence 
@@ -128,14 +125,6 @@ public PresenceAvailability Presence
     /// </summary>
     public static event Action<UserObject> OnSelectedParticipantCall;
 
-    /// <summary>
-    /// Start 
-    /// </summary>
-    void Start()
-    {
-        defaultIconTexture = profileIcon.texture;
-    }
-
     /// <summary>
     /// copy user object 
     /// </summary>