Reintroduced n empty Issue#update_costs tp please old migrations.

git-svn-id: https://dev.finn.de/svn/cockpit/trunk@396 7926756e-e54e-46e6-9721-ed318f58905e

lib/issue_patch.rb

@@ -71,6 +71,11 @@ module IssuePatch
         return self.cost_object.subject
       end
     end
+    
+    def update_costs!
+      # This methods ist referenced from some migrations but does nothing
+      # anymore.
+    end
   end
 end