Fix starting if tabs.state does not exist

deluge/ui/gtkui/torrentdetails.py

@@ -111,6 +111,7 @@ class TorrentDetails(component.Component):
         # Get the state from saved file
         state = self.load_state()
 
+        if state:
             for item in state:
                 if not isinstance(item, tuple):
                     log.debug("Old tabs.state, using default..")