I see how this can occur if you have your own page that POSTs to the
subscribe CGI with no post data or post data consisting of all blank
values, but I don't see how it occurs with a post from the listinfo
subscribe form.
Can you explain exactly what the scenario is that triggers this error?
** P
Launchpad didn't gave be an opportunity to fill in version information, thus
here as a comment:
mailman 1:2.1.16-2ubuntu0.1
Ubuntu 14.04.4 LTS
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https://bugs.launchpad.net/bugs/1602608
Ti