[issue33663] Web.py wsgiserver3.py raises TypeError when CSS file is not found

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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keywords: +easy
nosy: +orsenthil
versions: +Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33663>
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