[issue5258] addpackage in site.py fails hard on badly formed .pth files

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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nosy: +Arfrever, dwr2, eric.araujo, haypo, tarek

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5258>
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