When the Florida Philharmonic folded last summer, many expected its audience to find a home with other local classical groups such as the New World Symphony, or the Miami Chamber Symphony. But the MCS hasn’t performed since February, due to a cash shortage, and this week, the chamber ensemble officially cancelled the 2003-04 season. As in the case of the Florida Phil, donors to the MCS have been reluctant to throw good money after bad, and the group has not been able to stabilize its finances in the 11 months since its troubles became public knowledge.