Open the link contained in the selected item.

        If there is more than one link contained in the item, prompt the user
        to choose which link to open.

def open_link(self):
        """
        Open the link contained in the selected item.

        If there is more than one link contained in the item, prompt the user
        to choose which link to open.
        """
        data = self.get_selected_item()
        if data['type'] == 'Submission':
            link = self.prompt_and_select_link()
            if link:
                self.config.history.add(link)
                self.term.open_link(link)
        elif data['type'] == 'Comment':
            link = self.prompt_and_select_link()
            if link:
                self.term.open_link(link)
        else:
            self.term.flash()