Half a day after SWAT teams combed through Oakbrook Center in the wake of a gunfight that left four people injured, a flock of Christmas Eve shoppers filled the upscale mall’s promenades, unfazed by the burst of violence.“ I wasn’t scared to come today, ” Chicagoan Justin Lewis said.... Sometimes you’ve just got to take that leap of faith and come out and do what you’ve got to do.” As of midday Oak Brook police were still looking for a man who allegedly participated in a Thursday evening shooto