[issue1581476] Text search gives bad count if called from variable trace

[Guilherme Polo]

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

This is indeed a problem with Tkinter only, but I didn't check what is
causing it yet.

For the suggestion about fixing the search method regarding the pattern:
the fix is almost fine, but we need to disallow None as a pattern.

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<http://bugs.python.org/issue1581476>
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