[issue7819] sys.call_tracing(): check arguments type

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

This very fix was already done in py3k with issue3661.
Unfortunately it was decided at the time that 2.6 is not affected...
Patch is OK, please apply.

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nosy: +amaury.forgeotdarc
stage:  -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7819>
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