[issue3022] mailbox module, two small fixes

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

The iteritems problem was fixed in r71046 from issue2625.  The tests in
mailbox.patch all pass at this point, though it doesn't look like the
line with blanks issue has been addressed in the code.

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nosy: +r.david.murray
versions: +Python 2.7, Python 3.1

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