sys.stdin can be None

in which case we can't check if it's a tty or read from it

Author: minrk

notebook/notebookapp.py

@@ -1206,7 +1206,7 @@ def init_terminals(self):
             log("Terminals not available (error was %s)", e)
 
     def init_signal(self):
-        if not sys.platform.startswith('win') and sys.stdin.isatty():
+        if not sys.platform.startswith('win') and sys.stdin and sys.stdin.isatty():
             signal.signal(signal.SIGINT, self._handle_sigint)
         signal.signal(signal.SIGTERM, self._signal_stop)
         if hasattr(signal, 'SIGUSR1'):