Fix issue with swarm isAvailable

lib/modules/swarm/index.js

@@ -39,8 +39,7 @@ class Swarm {
     // swarm needs geth to be running first
     this.events.once(constants.blockchain.blockchainReady, () => {
       this.swarm.isAvailable((err, isAvailable) => {
-        if (err) return this.logger.error('Error checking swarm availability', err);
-        if (isAvailable) {
+        if (!err || isAvailable) {
           this.logger.info("Swarm node found, using currently running node");
           return;
         }