OJ da Juiceman 's reps are rushing to his defense after what they say was an unjust arrest ... which led to a "serious medical emergency." OJ's management tells TMZ ... "While in custody, OJ suffered a serious medical episode related to his Type 1 diabetes on March 21 and required emergency treatment at Grady Memorial Hospital. His health and safety should never have been put at risk in this way." As we reported ... the trap rapper was arrested March 15 by the Georgia State Patrol and slapped