Issue #22629: Revise idle_test.htest, mostly docstring.  Start revision of
htests to add # htest # marker for coveragepy and stop tcl errors.
diff --git a/Lib/idlelib/configDialog.py b/Lib/idlelib/configDialog.py
index 112f31c..96a4b3f 100644
--- a/Lib/idlelib/configDialog.py
+++ b/Lib/idlelib/configDialog.py
@@ -22,7 +22,7 @@
 
 class ConfigDialog(Toplevel):
 
-    def __init__(self, parent, title, _htest=False, _utest=False):
+    def __init__(self, parent, title='', _htest=False, _utest=False):
         """
         _htest - bool, change box location when running htest
         _utest - bool, don't wait_window when running unittest
@@ -34,7 +34,7 @@
         self.wm_withdraw()
 
         self.configure(borderwidth=5)
-        self.title('IDLE Preferences')
+        self.title(title or 'IDLE Preferences')
         self.geometry(
                 "+%d+%d" % (parent.winfo_rootx() + 20,
                 parent.winfo_rooty() + (30 if not _htest else 150)))