Fix a traceback on exit in bpython.urwid.

Marien Zwart · Marien Zwart · commit 02d998419c77 · 2012-10-18T21:14:18.000+02:00
diff --git a/bpython/urwid.py b/bpython/urwid.py
@@ -624,7 +624,8 @@ def __init__(self, event_loop, palette, interpreter, config):
         self.current_output = None
         self._completion_update_suppressed = False
 
-        self.exit_value = None
+        # Bulletproof: this is a value extract_exit_value accepts.
+        self.exit_value = ()
 
         load_urwid_command_map(config)
 
