Fix bool operator on transparent colors returning false (#14413)

* Fix crash loading logbox

* Fix bool operator on transparent colors returning false

* Change files

* format

Author: acoates-ms

change/react-native-windows-984ae1a3-5950-4ab1-bebb-44b11bc5b147.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Fix bool operator on transparent colors returning false",
+  "packageName": "react-native-windows",
+  "email": "30809111+acoates-ms@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}

vnext/Microsoft.ReactNative/Fabric/Composition/ReactNativeIsland.cpp

@@ -979,10 +979,10 @@ ReactNativeIsland::GetComponentView() noexcept {
 
   if (auto fabricuiManager = ::Microsoft::ReactNative::FabricUIManager::FromProperties(
           winrt::Microsoft::ReactNative::ReactPropertyBag(m_context.Properties()))) {
-    auto rootComponentViewDescriptor = fabricuiManager->GetViewRegistry().componentViewDescriptorWithTag(
-        static_cast<facebook::react::SurfaceId>(m_rootTag));
-    return rootComponentViewDescriptor.view
-        .as<winrt::Microsoft::ReactNative::Composition::implementation::RootComponentView>();
+    if (auto view = fabricuiManager->GetViewRegistry().findComponentViewWithTag(
+            static_cast<facebook::react::SurfaceId>(m_rootTag))) {
+      return view.as<winrt::Microsoft::ReactNative::Composition::implementation::RootComponentView>();
+    }
   }
   return nullptr;
 }

vnext/Microsoft.ReactNative/Fabric/platform/react/renderer/graphics/HostPlatformColor.h

@@ -38,7 +38,9 @@ struct Color {
 };
 
 namespace HostPlatformColor {
-static const facebook::react::Color UndefinedColor{{0, 0, 0, 0} /*Black*/, {} /*Empty PlatformColors*/};
+static const facebook::react::Color UndefinedColor{
+    {0, 0, 0, 0} /*Black*/,
+    {"__undefinedColor"} /*Empty PlatformColors*/};
 } // namespace HostPlatformColor
 
 inline Color hostPlatformColorFromComponents(ColorComponents components) {