Fix _listmatch() again so that it works with group lists containing only one group. Thanks to Dirk Froemberg for supplying a patch for this. I will be closing out the PR and moving this to the 2.2.5 branch later: my login sessions to freefall from Columbia are ridiculously spotty today.
Fix _listmatch() again so that it works with group lists containing only
one group. Thanks to Dirk Froemberg for supplying a patch for this. I will
be closing out the PR and moving this to the 2.2.5 branch later: my login
sessions to freefall from Columbia are ridiculously spotty today.

PR:	5610
Submitted by:	Dirk Froemberg <ibex@physik.TU-Berlin.DE>

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