request_property_impl: Add missing specialisation for Entity::Vertex

src/OpenVolumeMesh/Core/ResourceManagerT_impl.hh

@@ -124,6 +124,12 @@ struct request_property_impl {
     static PropertyTT<T, EntityTag> _(ResourceManager* /*resman*/, const std::string& /*_name*/, const T /*_def*/);
 };
 
+template<class T>
+struct request_property_impl<T, Entity::Vertex>{
+    static PropertyTT<T, Entity::Vertex> _(ResourceManager *resman, const std::string &_name, const T _def) {
+        return resman->request_vertex_property<T>(_name, _def);
+    }
+};
 template<class T>
 struct request_property_impl<T, Entity::Edge>{
     static PropertyTT<T, Entity::Edge> _(ResourceManager *resman, const std::string &_name, const T _def) {