bpo-35379: When exiting IDLE, catch any AttributeError. (GH-16212)

One happens when EditorWindow.close is called twice.
Printing a traceback, when IDLE is run from a terminal,
is useless and annoying.

Lib/idlelib/NEWS.txt

@@ -2,6 +2,13 @@ What's New in IDLE 3.8.0 (since 3.7.0)
 Released on 2019-10-20?
 ======================================
 
+bpo-35379: When exiting IDLE, catch any AttributeError.  One happens
+when EditorWindow.close is called twice.  Printing a traceback, when
+IDLE is run from a terminal, is useless and annoying.
+
+bpo-38183: To avoid test issues, test_idle ignores the user config
+directory.  It no longer tries to create or access .idlerc or any files
+within.  Users must run IDLE to discover problems with saving settings.
 
 bpo-38077: IDLE no longer adds 'argv' to the user namespace when
 initializing it.  This bug only affected 3.7.4 and 3.8.0b2 to 3.8.0b4.

Lib/idlelib/editor.py

@@ -1061,10 +1061,13 @@ class EditorWindow(object):
             return self.io.maybesave()
 
     def close(self):
+        try:
             reply = self.maybesave()
             if str(reply) != "cancel":
                 self._close()
             return reply
+        except AttributeError:  # bpo-35379: close called twice
+            pass
 
     def _close(self):
         if self.io.filename:

Misc/NEWS.d/next/IDLE/2019-09-17-01-28-56.bpo-35379.yAECDr.rst

+When exiting IDLE, catch any AttributeError.  One happens when
+EditorWindow.close is called twice.  Printing a traceback, when IDLE is run
+from a terminal, is useless and annoying.