tweak unicode from tracker

src/core.py

@@ -736,9 +736,9 @@ Space:") + " " + nice_free)
                     self.set_supp_torrent_state_val(event['unique_ID'], 
                                                 "tracker_status",
                                                 tracker_status)
-                except Exception, e:
+                except UnicodeDecodeError:
                     print "There was a problem displaying a tracker alert. Most\
-likely the tracker did not responsd in utf-8.", e
+likely the tracker did not responsd in utf-8."
 
             elif event['event_type'] is self.constants['EVENT_TRACKER_WARNING']:
                 # Probably will need proper formatting later, not tested yet