[BE] Re-insert assert() to catch out-of-memory access in the ind_list[] buffer

The assert() function catching the corner-case siatuations when ind_list[] buffer runs out of memory has been removed from the source code just before the selection testing. This ticket is to re-insert it back until the end of the IVAS development process. Ultimately, the assert() function will be deleted, leaving it up to the automatic memory re-allocation process to kick increasing the memory space.