From b5b3ea78c75fa283d490611676e1516ac78f5bfa 2015-10-26 20:16:24
From: Min RK <benjaminrk@gmail.com>
Date: 2015-10-26 20:16:24
Subject: [PATCH] restore check for readline

fix regression in debugger exit for non-readline contexts
---

diff --git a/IPython/core/debugger.py b/IPython/core/debugger.py
index c5548e4..f3a619b 100644
--- a/IPython/core/debugger.py
+++ b/IPython/core/debugger.py
@@ -288,7 +288,8 @@ class Pdb(OldPdb):
                 break
             finally:
                 # Pdb sets readline delimiters, so set them back to our own
-                self.shell.readline.set_completer_delims(self.shell.readline_delims)
+                if self.shell.readline is not None:
+                    self.shell.readline.set_completer_delims(self.shell.readline_delims)
 
     def new_do_up(self, arg):
         OldPdb.do_up(self, arg)