Test that CreateObject() returns an empty JsonObject

srcs/srcs.vcxproj

@@ -65,6 +65,7 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClInclude Include="JsonObject.h" />
     <ClInclude Include="StaticJsonBuffer.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />