alias set --debug: Only print nameservers if we fetched them (#166)

lib/alias.js

@@ -133,8 +133,12 @@ export default class Alias extends Now {
       let skipDNSVerification = false
 
       if (this._debug) {
+        if (domainInfo) {
+          console.log(`> [debug] Found domain ${domain} with verified:${domainInfo.verified}`)
+        } else {
           console.log(`> [debug] Found domain ${domain} and nameservers ${nameservers}`)
         }
+      }
 
       if (!usingZeitWorld && domainInfo) {
         if (domainInfo.verified) {