Show messages even when offline.

Author: nitish1211

app/src/main/java/com/zulip/android/activities/ZulipActivity.java

@@ -2391,6 +2391,9 @@ public void handleMessage(android.os.Message msg) {
                 } else {
                     displayChatBox(false);
                     displayFAB(true);
+                    //Displays old offline messages
+                    if (narrowedList == null)
+                        onReadyToDisplay(true);
                     networkStatus = Constants.STATUS_NOT_CONNECTED;
                     Snackbar.make(coordinatorLayout, R.string.no_connection, Snackbar.LENGTH_INDEFINITE).show();
                 }