showAttributeWarnings = function(response) {
        if (!_.has(response, 'data.invalidAttributes')) {
          return;
        }

        _.forEach(response.data.invalidAttributes,
          function(attribute, attributeName) {
            let warningMessage = '';

            _.forEach(attribute, function(attributeError) {
              warningMessage += (attributeError.message || '') + '<br />';
            });

            Notification.warning({
              title: 'Invalid attribute: ' + attributeName,
              message: warningMessage
            });
          });
      }
Shows an appropriate error notification method for every invalid
attribute.
@param  {Object} response A response object returned by sails after a
                          erroneous blueprint request.