Handle an old 'tabs.state' gracefully by just using the defaults.

deluge/ui/gtkui/torrentdetails.py

@@ -111,6 +111,12 @@ class TorrentDetails(component.Component):
         # Get the state from saved file
         state = self.load_state()
 
+        for item in state:
+            if not isinstance(item, tuple):
+                log.debug("Old tabs.state, using default..")
+                state = None
+                break
+                
         # The state is a list of tab_names in the order they should appear
         if state == None:
             # Set the default order