[issue18503] No assertion in test_del_param_on_nonexistent_header function and unused variables in some places in test_email.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset 61d9c561b63d by R David Murray in branch '3.3':
#18503: small cleanups in test_email.
http://hg.python.org/cpython/rev/61d9c561b63d

New changeset be5f1f0bea09 by R David Murray in branch 'default':
#18503: small cleanups in test_email.
http://hg.python.org/cpython/rev/be5f1f0bea09

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nosy: +python-dev

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