bpo-34964: Make Tkinter sources more readable by adding blank lines. (GH-9822)

diff --git a/Lib/tkinter/dialog.py b/Lib/tkinter/dialog.py
index f61c5f7..cb463f7 100644
--- a/Lib/tkinter/dialog.py
+++ b/Lib/tkinter/dialog.py
@@ -19,8 +19,10 @@
                       *cnf['strings']))
         try: Widget.destroy(self)
         except TclError: pass
+
     def destroy(self): pass
 
+
 def _test():
     d = Dialog(None, {'title': 'File Modified',
                       'text':