Item12368: Add a default for groups

This was crashing with undefined input to lc on some versions of windows.

git-svn-id: http://svn.foswiki.org/trunk/core@16460 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12330: cygwin checker crashes when using cygwin perl

Not sure what this checker intended to do, but it and the MSWin32
checker should be basically the same,  They are not really checkers -
they create the MS Windows Specific section of the configuration.

git-svn-id: http://svn.foswiki.org/trunk/core@16461 0b4bb1d4-4e5a-0410-9cc4-b2b747904278