Uninvite functions on error

If a function responding to an event has an unhandled exception, we
print a message telling what went wrong and that the function has been
uninvited.  However, I never actually uninvite the function from the
event.  I have now added in a call to uninvite() before printing the
message.

libsaria/event.py

@@ -40,6 +40,7 @@ def start(key, *args):
 			else:
 				start_thread(func, *args)
 		except Exception,e:
+			uninvite(key, func)
 			print
 			print "===== EVENT ERROR ====="
 			print "Event:", key