[views/workflow/tmppng] fix console crash on nth call to this one-shot view The underlying design issue is not addressed here, only a cosmetic and "we understand and document what's happening" note. Related to #3400448.

if not rql('CWConstraintType X WHERE X name "RQLUniqueConstraint"',
           ask_confirm=False):
    rql('INSERT CWConstraintType X: X name "RQLUniqueConstraint"',
        ask_confirm=False)