Fixed issues found by PVS-Studio

Source/Editor/Windows/Assets/BehaviorTreeWindow.cs

@@ -430,8 +430,7 @@ namespace FlaxEditor.Windows.Assets
 
         private bool SaveSurface()
         {
-            _surface.Save();
-            return false;
+            return _surface.Save();
         }
 
         private void SetCanEdit(bool canEdit)

Source/Editor/Windows/Assets/VisualScriptWindow.cs

@@ -1202,7 +1202,8 @@ namespace FlaxEditor.Windows.Assets
 
         private bool SaveSurface()
         {
-            _surface.Save();
+            if (_surface.Save())
+                return true;
 
             // Reselect actors to prevent issues after Visual Script properties were modified
             Editor.Windows.PropertiesWin.Presenter.BuildLayoutOnUpdate();