6547500: 2/2 j.l.i.: .retransformClasses throws unexpected InternalError Summary: retransformClasses() should catch both an empty classes array and a classes array that contains a NULL element. Reviewed-by: ohair, sspitsyn

37a05a11f281b4d238e2f9e7ebb67c63f64d0e77 jdk7-b24