[Notifications] Fix email KeyError with status name

Fix user reported error:

    Notification failure using email:
    [Failure instance: Traceback: <class 'KeyError'>: 'name'

This was due to using empty dict used with get_status where a list of
keys is now required or the all_keys parameter is used.

Fixes: #3303

deluge/plugins/Notifications/deluge_notifications/core.py

@@ -176,7 +176,7 @@ Date: %(date)s
     def _on_torrent_finished_event(self, torrent_id):
         log.debug('Handler for TorrentFinishedEvent called for CORE')
         torrent = component.get('TorrentManager')[torrent_id]
-        torrent_status = torrent.get_status({})
+        torrent_status = torrent.get_status(['name', 'num_files'])
         # Email
         subject = _('Finished Torrent "%(name)s"') % torrent_status
         message = (

deluge/plugins/Notifications/setup.py

@@ -17,7 +17,7 @@ from setuptools import find_packages, setup
 __plugin_name__ = 'Notifications'
 __author__ = 'Pedro Algarvio'
 __author_email__ = 'pedro@algarvio.me'
-__version__ = '0.3'
+__version__ = '0.4'
 __url__ = 'http://dev.deluge-torrent.org/'
 __license__ = 'GPLv3'
 __description__ = 'Plugin which provides notifications to Deluge.'