Run consume logic in a separate thread

Author: GaryWilber

lib/kafka-consumer.js

@@ -385,7 +385,7 @@ KafkaConsumer.prototype.unsubscribe = function() {
  * is fetched.
  */
 KafkaConsumer.prototype.consume = function(number, cb) {
-  var timeoutMs = this._consumeTimeout || DEFAULT_CONSUME_TIME_OUT;
+  var timeoutMs = this._consumeTimeout !== undefined ? this._consumeTimeout : DEFAULT_CONSUME_TIME_OUT;
   var self = this;
 
   if ((number && typeof number === 'number') || (number && cb)) {