Deal with an errorMessage being sent, by copying it into the model.

@@ -199,7 +199,13 @@ define(function(require) {
             }
             function api(apiName, data) {
                 var apiHandler = globalOptions.api || function(apiName, data) {};
-                return apiHandler(apiName, data, {sessionId: self.get('sessionId')}).done(applyLoginResults);
+                return apiHandler(apiName, data, {sessionId: self.get('sessionId')}).always(function() {
+                    self.unset('errorMessage');
+                }).done(applyLoginResults).error(function(xhr) {
+                    if (xhr.responseJSON && xhr.responseJSON.errorMessage) {
+                        self.set('errorMessage', xhr.responseJSON.errorMessage);
+                    }
+                });
             }
             var addProviderData = _.bind(function addProviderData() {
                 var args = _.toArray(arguments);