Nullify output from lexicon_cmd to prevent getting wrong return codes

dnsapi/dns_lexicon.sh

@@ -92,7 +92,7 @@ dns_lexicon_add() {
   _savedomainconf LEXICON_OPTS "$LEXICON_OPTS"
 
   # shellcheck disable=SC2086
-  $lexicon_cmd "$PROVIDER" $LEXICON_OPTS create "${domain}" TXT --name="_acme-challenge.${domain}." --content="${txtvalue}"
+  $lexicon_cmd "$PROVIDER" $LEXICON_OPTS create "${domain}" TXT --name="_acme-challenge.${domain}." --content="${txtvalue}" >/dev/null
 
 }
 
@@ -108,6 +108,6 @@ dns_lexicon_rm() {
   domain=$(printf "%s" "$fulldomain" | cut -d . -f 2-999)
 
   # shellcheck disable=SC2086
-  $lexicon_cmd "$PROVIDER" $LEXICON_OPTS delete "${domain}" TXT --name="_acme-challenge.${domain}." --content="${txtvalue}"
+  $lexicon_cmd "$PROVIDER" $LEXICON_OPTS delete "${domain}" TXT --name="_acme-challenge.${domain}." --content="${txtvalue}" >/dev/null
 
 }