[3.6] bpo-31135: ttk: fix LabeledScale and OptionMenu destroy() method (#3025) #3030
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bpo-31135: Call the parent destroy() method even if the used
attribute doesn't exist.
The LabeledScale.destroy() method now also explicitly clears label
and scale attributes to help the garbage collector to destroy all
widgets.
(cherry picked from commit cd7e9c1)
https://bugs.python.org/issue31135