What is Bonum Defendentis Ex Integra Causa; Malum Ex Quolibet Defectu?

Legal Definition
The success of a defendant depends on a perfect case; his loss arises from some defect 11 Coke, 68a.
-- Black's Law Dictionary
Legal Definition
A defendants good comes out of a good cause, his disaster from some defect.
-- Ballentine's Law Dictionary