[UWP Renderer] Add a null check to requirements in MeetsRequirements (#8235)

* Switch to gotFocus (#8148) (#8150)

* Update custom.props

* [UWP] Update custom.props for object model release (#8225)

* 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

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

* [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>

* Add null check to MeetsRequirements

* Remove comment

---------

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

Author: anna-dingler

source/uwp/SharedRenderer/lib/Util.cpp

@@ -481,25 +481,27 @@ bool MeetsRequirements(winrt::IAdaptiveCardElement const& cardElement, winrt::Ad
     winrt::IVector<winrt::AdaptiveRequirement> requirements = cardElement.Requirements();
     bool meetsRequirementsLocal = true;
 
-    for (auto req : requirements)
+    if (requirements)
     {
-        // winrt::hstring name = req.Name();
-        winrt::hstring registrationVersion = featureRegistration.Get(req.Name());
-
-        if (registrationVersion.empty())
-        {
-            meetsRequirementsLocal = false;
-        }
-        else
+        for (auto req : requirements)
         {
-            std::string requirementVersionString = HStringToUTF8(req.Version());
-            if (requirementVersionString != "*")
+            winrt::hstring registrationVersion = featureRegistration.Get(req.Name());
+
+            if (registrationVersion.empty())
+            {
+                meetsRequirementsLocal = false;
+            }
+            else
             {
-                AdaptiveCards::SemanticVersion requirementSemanticVersion(requirementVersionString);
-                AdaptiveCards::SemanticVersion registrationSemanticVersion(HStringToUTF8(registrationVersion));
-                if (registrationSemanticVersion < requirementSemanticVersion)
+                std::string requirementVersionString = HStringToUTF8(req.Version());
+                if (requirementVersionString != "*")
                 {
-                    meetsRequirementsLocal = false;
+                    AdaptiveCards::SemanticVersion requirementSemanticVersion(requirementVersionString);
+                    AdaptiveCards::SemanticVersion registrationSemanticVersion(HStringToUTF8(registrationVersion));
+                    if (registrationSemanticVersion < requirementSemanticVersion)
+                    {
+                        meetsRequirementsLocal = false;
+                    }
                 }
             }
         }