Don't instantiate job class to check concurrency limit if the key is not set

Author: rosa

app/models/solid_queue/job/concurrency_controls.rb

@@ -37,7 +37,7 @@ def release_next_blocked_job
         end
 
         def concurrency_limited?
-          concurrency_limit.to_i > 0 && concurrency_key.present?
+          concurrency_key.present? && concurrency_limit.to_i > 0
         end
 
         def job_class