[issue869780] curselection() in Tkinter.py should return ints

[Guilherme Polo]

Guilherme Polo <ggpolo at gmail.com> added the comment:

_getints already call splitlist, so there isn't much point in calling
_getints after calling splitlist.

And the Tk documentation says an empty string should be returned in case
there is no selection, but that is Tk. I don't see any problem in
returning None instead of '' here in Python.

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