Replace call to present? with non-rails equivalent.

Also bump the version to 0.1.3.

Author: Jack Veenstra

lib/resque/plugins/round_robin/round_robin.rb

@@ -28,7 +28,9 @@ def queue_depth queuename
     def should_work_on_queue? queuename
       return true if @queues.include? '*'  # workers with QUEUES=* are special and are not subject to queue depth setting
       max = DEFAULT_QUEUE_DEPTH
-      max = ENV["RESQUE_QUEUE_DEPTH"].to_i if ENV["RESQUE_QUEUE_DEPTH"].present?
+      unless ENV["RESQUE_QUEUE_DEPTH"].nil? || ENV["RESQUE_QUEUE_DEPTH"] == ""
+        max = ENV["RESQUE_QUEUE_DEPTH"].to_i
+      end
       return true if max == 0 # 0 means no limiting
       cur_depth = queue_depth(queuename)
       log! "queue #{queuename} depth = #{cur_depth} max = #{max}"

lib/resque/plugins/round_robin/version.rb

@@ -1,7 +1,7 @@
 module Resque
   module Plugins
     module RoundRobin
-      VERSION = "0.1.2"
+      VERSION = "0.1.3"
     end
   end
 end