don't try to delete DOMAINS_TXT on early failure when not yet set
don't try to delete DOMAINS_TXT on early failure when not yet set

Vitexus/dehydrated,ahnooie/dehydrated,erorus/letsencrypt.sh,lukas2511/dehydrated,dennisschuerholz/dehydrated,lukas2511/letsencrypt.sh,Rayne/letsencrypt.sh