Corretti alcuni Warnings

WebWindowComplex/Json/JsonUtility.cs

@@ -100,7 +100,11 @@ namespace WebWindowComplex.Json
                 sGlass = m_sGlass
             };
             foreach (var Area in AreaList)
-                Window.AreaList.Add((Frame)Area.Deserialize(null, Window));
+            {
+                JsonFrame jf = (JsonFrame)Area;
+                Frame frame = (Frame)jf.Deserialize(null, Window);
+                Window.AreaList.Add(frame ?? new(null, Window));
+            }
             return Window;
         }
     }
@@ -155,7 +159,7 @@ namespace WebWindowComplex.Json
             m_AreaType = AreaType;
         }
 
-        internal virtual Area? Deserialize(Area ParentArea, Window ParentWindow)
+        internal virtual Area? Deserialize(Area? ParentArea, Window ParentWindow)
         {
             return null;
         }
@@ -281,7 +285,7 @@ namespace WebWindowComplex.Json
             base.GroupId = GroupId;
         }
 
-        internal override Area Deserialize(Area ParentArea, Window ParentWindow)
+        internal override Area Deserialize(Area? ParentArea, Window ParentWindow)
         {
             Frame newFrame = new Frame(null, ParentWindow);
             newFrame.SetGroupId(GroupId);
@@ -1109,7 +1113,7 @@ namespace WebWindowComplex.Json
             var RawType = (string?)item["AreaType"];
             AreaTypes Type = AreaTypes.NULL;
             Enum.TryParse<AreaTypes>(RawType, out Type);
-            JsonArea JsonArea = null;
+            JsonArea JsonArea = new JsonArea(AreaTypes.NULL);
             switch (Type)
             {
                 case AreaTypes.FRAME:
@@ -1143,12 +1147,8 @@ namespace WebWindowComplex.Json
                     }
             }
             if (!Information.IsNothing(JsonArea))
-            {
-                serializer.Populate(item.CreateReader(), JsonArea);
-                return JsonArea;
-            }
-            else
-                return null;
+                serializer.Populate(item.CreateReader(), JsonArea!);
+            return JsonArea!;
         }
 
         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)