Update updater_v2.rb

Author: akabishau

app/models/util/updater_v2.rb

@@ -70,6 +70,7 @@ def db_mgr
       else
         @db_mgr.event = @load_event # always has acccess to the latest event
       end
+      return @db_mgr
     end
 
     def update_current_studies