add null check for UX UT

marcpems · marcpems · commit f7737e417c36 · 2020-06-03T12:10:47.000+01:00
diff --git a/Microsoft.Toolkit.Uwp.UI.Controls/TokenizingTextBox/TokenizingTextBox.cs b/Microsoft.Toolkit.Uwp.UI.Controls/TokenizingTextBox/TokenizingTextBox.cs
@@ -497,7 +497,7 @@ private void GuardAgainstPlaceholderTextLayoutIssue()
             //   We toggle the visibility of the Placeholder ContentControl in order to force it's layout to update properly
             var placeholder = ContainerFromItem(_lastTextEdit).FindDescendantByName("PlaceholderTextContentPresenter");
 
-            if (placeholder.Visibility == Visibility.Visible)
+            if (placeholder?.Visibility == Visibility.Visible)
             {
                 placeholder.Visibility = Visibility.Collapsed;
 

Original file line number	Diff line number	Diff line change
`@@ -497,7 +497,7 @@ private void GuardAgainstPlaceholderTextLayoutIssue()`
`497`	`497`	`// We toggle the visibility of the Placeholder ContentControl in order to force it's layout to update properly`
`498`	`498`	`var placeholder = ContainerFromItem(_lastTextEdit).FindDescendantByName("PlaceholderTextContentPresenter");`
`499`	`499`
`500`		`- if (placeholder.Visibility == Visibility.Visible)`
	`500`	`+ if (placeholder?.Visibility == Visibility.Visible)`
`501`	`501`	`{`
`502`	`502`	`placeholder.Visibility = Visibility.Collapsed;`
`503`	`503`