More robust lock counting (bug 874)

Thanks to Ville-Pekka Vainio for forwarding this.

src/gpodder/gui.py

@@ -2640,7 +2640,7 @@ class gPodder(BuilderWidget, dbus.service.Object):
             title = N_('Remove %d episode?', 'Remove %d episodes?', count) % count
             message = _('If you remove these episodes, they will be deleted from your computer. If you want to listen to any of these episodes again, you will have to re-download the episodes in question.')
 
-        locked_count = sum(int(e.is_locked) for e in episodes if e.is_locked is not None)
+        locked_count = sum(e.is_locked for e in episodes)
 
         if count == locked_count:
             title = _('Episodes are locked')

src/gpodder/model.py

@@ -780,8 +780,19 @@ class PodcastEpisode(PodcastModelObject):
 
         self.state = gpodder.STATE_NORMAL
         self.is_played = False
+
+        # Initialize the "is_locked" property
+        self._is_locked = False
         self.is_locked = channel.channel_is_locked
 
+    def get_is_locked(self):
+        return self._is_locked
+
+    def set_is_locked(self, is_locked):
+        self._is_locked = bool(is_locked)
+
+    is_locked = property(fget=get_is_locked, fset=set_is_locked)
+
     def save(self):
         if self.state != gpodder.STATE_DOWNLOADED and self.file_exists():
             self.state = gpodder.STATE_DOWNLOADED