new: [letsencrypt] do not require admin email anymore.

letsencrypt/hooks/dc-pre-run

@@ -17,15 +17,13 @@ set -e
 
 service_def=$(get_compose_service_def "$SERVICE_NAME")
 
-USER_EMAIL=$(echo "$service_def" | shyaml get-value options.email 2>/dev/null) || {
-    err "No ${WHITE}email${NORMAL} value in ${DARKYELLOW}$SERVICE_NAME${NORMAL} compose's ${WHITE}options${NORMAL}."
-    exit 1
-}
-
 config="
 $SERVICE_NAME:
   environment:
-    LETSENCRYPT_USER_MAIL: $USER_EMAIL"
+"
+if USER_EMAIL=$(echo "$service_def" | shyaml get-value options.email 2>/dev/null); then
+    config+="    LETSENCRYPT_USER_MAIL: $USER_EMAIL"
+fi
 
 if environment_def="$(printf "%s" "$service_def" | shyaml -y get-value options.env 2>/dev/null)"; then
     while read-0 key value; do