Title. Now returns empty info. It should response as shown here https://wiki.guildwars2.com/wiki/API:2/characters/:id/training:
training (array) - contains objects for each skill tree trained
id (integer) - Skill tree id, can be compared against the training section for each /v2/professions.
spent (integer) - Shows how many hero points have been spent in this tree
done (boolean - true/false) - States whether or not the tree is fully trained.