Comment 1 for bug 1574892

I see the same error when using IDLE for _Python 2.7_ when trying to open Options -> Configure IDLE:
$ idle
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1540, in __call__
    return self.func(*args)
  File "/usr/lib/python2.7/idlelib/EditorWindow.py", line 543, in config_dialog
    configDialog.ConfigDialog(self.top,'Settings')
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 72, in __init__
    self.LoadConfigs()
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 1103, in LoadConfigs
    self.LoadFontCfg()
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 1005, in LoadFontCfg
    self.SetFontSample()
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 883, in SetFontSample
    self.labelFontSample.config(font=newFont)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1329, in configure
    return self._configure('configure', cnf, kw)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1320, in _configure
    self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
TclError: expected integer but got ""
$ idle
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1540, in __call__
    return self.func(*args)
  File "/usr/lib/python2.7/idlelib/EditorWindow.py", line 543, in config_dialog
    configDialog.ConfigDialog(self.top,'Settings')
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 72, in __init__
    self.LoadConfigs()
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 1103, in LoadConfigs
    self.LoadFontCfg()
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 1005, in LoadFontCfg
    self.SetFontSample()
  File "/usr/lib/python2.7/idlelib/configDialog.py", line 883, in SetFontSample
    self.labelFontSample.config(font=newFont)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1329, in configure
    return self._configure('configure', cnf, kw)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1320, in _configure
    self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
TclError: expected integer but got ""