sniCallback: noop on async getCertificates error, fix #1

index.js

@@ -146,7 +146,10 @@ module.exports.create = function (autoSni) {
           // give the cert some time (2-5 min) to be validated and replaced before trying again
           certMeta.renewAt = (autoSni._dbg_now || Date.now()) + (2 * MIN) + (3 * MIN * Math.random());
           // let the update happen in the background
-          autoSni.getCertificatesAsync(domain, certMeta.certs).then(autoSni.cacheCerts);
+          autoSni.getCertificatesAsync(domain, certMeta.certs).then(autoSni.cacheCerts, function (error) {
+            // console.error('ERROR in le-sni-auto:');
+            // console.error(err.stack || err);
+          })
         }
 
         // return the valid cert right away