Callback undefined on subsequent poll() calls
Callback undefined on subsequent poll() calls

If the worker is running in non-looped mode (for testing in my case) the
callback is undefined on the first `poll()` recursion.  This means that
if a job is found (or all queues have been polled) the callback
originally passed to poll is lost.

raohuaming/meteor-node-resque,taskrabbit/node-resque,taskrabbit/node-resque,raohuaming/meteor-node-resque