Database tables with no prefix

I'm trying to use Garden to import from vBulletin, but my vBulletin tables don't have a prefix. The problem is that doing $Construct->DatabasePrefix(''); doesn't let me switch to the vBulletin tables because the DatabasePrefix method won't let me set a blank prefix. What should I do?
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$Database = Gdn::Database(); $Result = $Database->Query('SELECT 1+1'); // or maybe // $SQL = Gdn::Database()->SQL() // $SQL->Query('SELECT 2+2');
Not tested.
http://github.com/lussumo/Garden/issues#issue/134