Error when open /taxonomy/term/%/% in the panel.

When metatag module loads the taxonomy term for the current taxonomy overview page it does not check if the lookup a result is object and passes a potential string value into the "metatag_entity_view" function, when you go to /taxonomy/term/%/%. This will eventually result in an EntityMalformedException: Missing bundle property on entity of type taxonomy_term. I attach a patch.