Fixes #1043 Parsing of bookmarks fail with missing nick element.

spec/bookmarks.js

@@ -444,7 +444,7 @@
                                         'name': 'Another room',
                                         'autojoin': 'false',
                                         'jid': 'another@conference.shakespeare.lit'
-                                    }).c('nick').t('JC').up().up();
+                                    }); // Purposefully exclude the <nick> element to test #1043
                 _converse.connection._dataRecv(test_utils.createRequest(stanza));
                 expect(_converse.bookmarks.models.length).toBe(2);
                 expect(_converse.bookmarks.findWhere({'jid': 'theplay@conference.shakespeare.lit'}).get('autojoin')).toBe(true);

src/converse-bookmarks.js

@@ -382,7 +382,7 @@
                             'jid': bookmark.getAttribute('jid'),
                             'name': bookmark.getAttribute('name'),
                             'autojoin': bookmark.getAttribute('autojoin') === 'true',
-                            'nick': bookmark.querySelector('nick').textContent
+                            'nick': _.get(bookmark.querySelector('nick'), 'textContent')
                         });
                     });
                 },