[bug] recursive_events_over_DST fail with deleted events

lib/tasks/fablab/fix.rake

@@ -60,11 +60,12 @@ namespace :fablab do
 
     task recursive_events_over_DST: :environment do
       include ApplicationHelper
+      failed_ids = []
       groups = Event.group(:recurrence_id).count
       groups.keys.each do |recurrent_event_id|
         if recurrent_event_id
-          initial_event = Event.find(recurrent_event_id)
+          begin
-          if initial_event
+            initial_event = Event.find(recurrent_event_id)
             Event.where(recurrence_id: recurrent_event_id).where.not(id: recurrent_event_id).each do |event|
               availability = event.availability
               if initial_event.availability.start_at.hour != availability.start_at.hour
@@ -73,11 +74,16 @@ namespace :fablab do
                 availability.save!
               end
             end
-          else
+          rescue ActiveRecord::RecordNotFound
-            puts "Error: The initial event (id: #{recurrent_event_id}) of the recurrence was not found. You may have to correct events manually"
+            failed_ids.push recurrent_event_id
           end
         end
       end
+
+      if failed_ids.size > 0
+        puts "WARNING: The events with IDs #{failed_ids} were not found.\n These were initial events of a recurrence.\n\n You may have to correct the following events manually (IDs): "
+        puts "#{Events.where(recurrence_id: failed_ids).map(&:id)}"
+      end
     end
   end
 end