Comment 3 for bug 1015369

As Ryan said, this is low priority.
I can see 2 potential fixes:
 a.) change list_lists to handle the closed pipe correctly and exit without trace
 b.) change 'grep -q' to 'grep >/dev/null'

Additionally:
 * this also affects debian, and carrying ubuntu delta for this change doesn't seem to make much sense
 * list_lists is not present in mailman upstream 3.0 line.

Ryan,
  Given the above, if you'd like to see this fixed, could you report the bug to debian [1]? and then link that bug to this?
   I personally think that the 'grep >/dev/null' is a sufficient fix given the fact that list_lists is gone in upstream.

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[1] http://www.debian.org/Bugs/Reporting