[issue21402] tkinter.ttk._val_or_dict assumes tkinter._default_root exists

[Stephen Paul Chappell]

Stephen Paul Chappell added the comment:

It seems that most functions and methods do not bother checking if _default_root exists before trying to access it. However, upon seeing line 366 in ttk (if tkinter._support_default_root:), my recommendation would be to change line 319 to "if tkinter._support_default_root and tkinter._default_root:" to fix the problem. Several similar lines appear in tkinter\__init__.py at locations 1835, 1845, and 2050.

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<http://bugs.python.org/issue21402>
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