Apply suggestions from code review

Co-authored-by: Rosario Pulella <Rosariopulella@gmail.com>

Author: jamesmcroft

Microsoft.Toolkit.Uwp.UI.Controls.Input/TokenizingTextBox/TokenizingTextBoxAutomationPeer.cs

@@ -78,13 +78,13 @@ protected override string GetClassNameCore()
         protected override string GetNameCore()
         {
             string name = this.OwningTokenizingTextBox.Name;
-            if (!string.IsNullOrEmpty(name))
+            if (!string.IsNullOrWhiteSpace(name))
             {
                 return name;
             }
 
             name = AutomationProperties.GetName(this.OwningTokenizingTextBox);
-            return !string.IsNullOrEmpty(name) ? name : base.GetNameCore();
+            return !string.IsNullOrWhiteSpace(name) ? name : base.GetNameCore();
         }
 
         /// <summary>
@@ -128,4 +128,4 @@ protected override IList<AutomationPeer> GetChildrenCore()
             return peers;
         }
     }
-}
+}