Changed MTScoreAssignments to return silent `NULL` if `outType = 'sub'` or original results object if `outType = 'full'` instead of throwing stop error.
Changed MTScoreAssignments to return silent `NULL` if `outType = 'sub'` or original results object if `outType = 'full'` instead of throwing stop error.

andrewbrownphd/MetaTurkR,andrewbrownphd/MetaTurkR,andrewbrownphd/MetaTurkR