Add some defaults from set -u

src/share/poudriere/common.sh

@@ -77,7 +77,7 @@ err() {
 	fi
 	# Try to set status so other processes know this crashed
 	# Don't set it from children failures though, only master
-	if [ -z "${PARALLEL_CHILD}" ] && was_a_bulk_run; then
+	if [ "${PARALLEL_CHILD:-0}" -eq 0 ] && was_a_bulk_run; then
 		if [ -n "${MY_JOBID}" ]; then
 			bset ${MY_JOBID} status "${EXIT_STATUS:-crashed:}" \
 			    2>/dev/null || :

src/share/poudriere/include/parallel.sh

@@ -190,7 +190,7 @@ _reap_children() {
 	local pid
 	local ret=0
 
-	for pid in ${PARALLEL_PIDS}; do
+	for pid in ${PARALLEL_PIDS-}; do
 		# Check if this pid is still alive
 		if ! kill -0 ${pid}; then
 			# This will error out if the return status is non-zero