[CORE] Fix potential null dereferencing

Source/FixItCore/Private/FixItBackend.cpp

@@ -53,7 +53,9 @@ namespace {
 	{
 		fixit::PlayerData Out = fixit::PlayerData(FFixItTranslationLayer::ToStd(PlayerData->PrefilledStr));
 		for (const auto* Item : PlayerData->Items) {
-			Out.Items.emplace_back(UFixItPlayerDataItemConvertTo(Item));
+			if (Item != nullptr) {
+				Out.Items.emplace_back(UFixItPlayerDataItemConvertTo(Item));
+			}
 		}
 		return Out;
 	}