Issue #185 user_avatar and uri_sound NULL

sails/src/api/models/Scene.js

@@ -100,6 +100,8 @@ module.exports = {
            if (found) {
              // Now we have everything, so we add the picto to the list
              stuPicto.attributes.expression = stuPicto.attributes.expression ? stuPicto.attributes.expression : picto.expressions[0].text;
+             stuPicto.attributes.uri_sound = stuPicto.attributes.uri_sound ? stuPicto.attributes.uri_sound : null;
+             stuPicto.attributes.user_avatar = stuPicto.attributes.user_avatar ? stuPicto.attributes.user_avatar : null;
              var stuPictoToAdd = {
                 "id": stuPicto.id,
                 "picto": stuPicto.picto,