Gnome-Do RTM plugin should return the text if an error occurs

[lumbricus]

If you add a new task with the Remember The Milk-Plugin and if the operation was successfull, the link to the new task is returned, i.e. if you hit the return key afterwards, you are led to the RTM webpage with the task. If the operation was not successful (e.g. if there is no network connection) an error message is printed to STDOUT, but usually you'll see only a blank gnome-do window. It would be great if the text is not lost in such a situation. For example the text could be returned to the user and with the copy & paste plugin the text could be used and saved somewhere else.