Strange bug with starting resque-pool

[toots]

Hi,

We've run into a bug here using resque-pool:

resque-pool-0.3.0/lib/resque/pool.rb:312:in `worker_delta_for': undefined method `-' for nil:NilClass (NoMethodError)

I haven't been able to fully understand the issue where here's how the config object looks at line 312:

{"ac446872-4ad9-4f69-b075-a8017aa9e049"=>1, "foo-1"=>nil}

The function is called for foo-1 so we get nil and boom.

This PR is a naive fix.. Maybe there's a better way to deal with this issue?

[nevans]

That looks like an invalid config to me. It ought to be a {"queue spec" => count} hash, and nil count indicates an error. We could silently eat the nil and pretend it's a zero (as you did). But I think it's probably better to give a very loud warning or even a fatal error for an invalid config.