added operand validator on mainform marvinweb search box
added operand validator on mainform marvinweb search box
albireox/marvin,albireox/marvin,sdss/marvin,sdss/marvin,bretthandrews/marvin,sdss/marvin,albireox/marvin,albireox/marvin,bretthandrews/marvin,bretthandrews/marvin,bretthandrews/marvin,sdss/marvin