In the event of an appeal in cassation against a decision which has found an employer guilty of dismissal without real and serious cause or of dismissal being null and void pursuant to the provisions of Articles L. 1132-4, L. 1134-4, L. 1144-3, L. 1152-3, L. 1153-4, L. 1235-3 and L. 1235-11, the quashing of the head of the aforementioned decision entails the quashing of the head of the decision which automatically orders the reimbursement of unemployment benefits.