NOC shows info about Bourreaux

When a Bourreau was active but not updated in the past
month, it would disappear from the NOC. Fixed here.

Author: prioux

BrainPortal/app/controllers/noc_controller.rb

@@ -200,7 +200,9 @@ def gather_info(since_when) #:nodoc:
 
     # RemoteResources, including the portal itself
     @myself        = RemoteResource.current_resource
-    @bourreaux     = Bourreau.where([ "updated_at > ?", offline_resource_limit.ago ]).order(:name).all # must have been toggled within a month
+    acttasks_bids  = CbrainTask.active.group(:bourreau_id).pluck(:bourreau_id)
+    updated_bids   = Bourreau.where([ "updated_at > ?", offline_resource_limit.ago ]).pluck(:id) # must have been toggled within a month.
+    @bourreaux     = Bourreau.where(:id => (acttasks_bids | updated_bids)).order(:name).all
 
     # Some numbers: active users, active tasks, sum of files sizes being transferred, sum of CPU time
     @active_users  = CbrainSession.session_model