Item12735: added more unit tests for basic table functionality

git-svn-id: http://svn.foswiki.org/trunk/UnitTestContrib@17431 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12735: make testrunner a bit more robust in a partially configured environment

git-svn-id: http://svn.foswiki.org/trunk/UnitTestContrib@17432 0b4bb1d4-4e5a-0410-9cc4-b2b747904278