removed request for input on null environment variable

dependent/compose.yml

@@ -155,12 +155,12 @@ services:
       - ${HOME}/.all.env
       - ${HOME}/.certbot.env
     environment:
-      EMAIL: ${CERTBOT_EMAIL:?Provide an email for certificate process}
+      EMAIL: ${CERTBOT_EMAIL}
       DOMAINS: ${CERTBOT_CHALLENGED_DOMAINS:-"${SERVER_FQDN},*.${SERVER_FQDN}"}
-      AUTHENTICATOR: ${CERTBOT_AUTHENTICATOR:?Specify preferred challenge}
-      WEBROOT_PATH: ${SERVER_WEBROOT_PATH:?Specify the web root of webserver or main web root of reverse proxy server}
+      AUTHENTICATOR: ${CERTBOT_AUTHENTICATOR}
+      WEBROOT_PATH: ${SERVER_WEBROOT_PATH}
       ISSUANCE_TIMEOUT: 300
-      CRON: ${CERTBOT_CRON:Provide CRON expression for renewal purposes}
+      # CRON: ${CERTBOT_CRON}
     # entrypoint: ["certonly"]
 
   cache0: