Better check to know whether we can save the model

src/converse-chatview.js

@@ -777,7 +777,7 @@
                 },
 
                 afterShown: function (focus) {
-                    if (_converse.connection.connected) {
+                    if (this.model.collection.browserStorage) {
                         // Without a connection, we haven't yet initialized
                         // localstorage
                         this.model.save();