[UWP Renderer] Add a null check to inline action rendering (#8228)

* Update custom.props for object model release

* Updated Xcode version (#8222)

* removed build step as they are redundant (#8201)

* removed build step as they are redundant

* added pod installation step

* Add a null check for inline Actions

Co-authored-by: Joseph Woo <Joseph.Woo@microsoft.com>

source/uwp/Renderer/lib/AdaptiveTextInputRenderer.cpp

@@ -41,8 +41,14 @@ namespace winrt::AdaptiveCards::Rendering::Uwp::implementation
             bool isMultiline = adaptiveTextInput.IsMultiline();
             winrt::TextInputStyle style = adaptiveTextInput.TextInputStyle();
             isMultiline &= style != winrt::TextInputStyle::Password;
-            textBoxParentContainer = render_xaml::ActionHelpers::HandleInlineAction(
+            auto textBoxWithInlineAction = render_xaml::ActionHelpers::HandleInlineAction(
                 renderContext, renderArgs, inputUIElement, textBoxParentContainer, isMultiline, inlineAction);
+
+            // If the inlineAction is ShowCard, textBoxWithInlineAction will be null and we should not update the parent container
+            if (textBoxWithInlineAction)
+            {
+                textBoxParentContainer = textBoxWithInlineAction;
+            }
         }
 
         if (!adaptiveTextInput.IsMultiline())