correctly null-terminate argument list after parsing arguments
correctly null-terminate argument list after parsing arguments

mrirecon/bart,sdimoudi/bart,sidward/bart,mrirecon/bart,sidward/bart,sdimoudi/bart,sidward/bart,mrirecon/bart,sdimoudi/bart,mrirecon/bart,sidward/bart,sdimoudi/bart,sdimoudi/bart,mrirecon/bart,sidward/bart