while read -a parents; do
references=""
parent=${parents[$n]}
- while [[ $parent != None ]]; do
+ while [[ ${parent:-None} != None ]]; do
references="<m$parent@t$thread> $references"
+ pp=$parent
parent=${parents[$parent]}
+ # Avoid looping over broken input (if ever)
+ parents[$pp]="None"
done
generate_message \