fix rescue block on migration

CHANGELOG

@@ -15,6 +15,7 @@ v 8.9.0 (unreleased)
 
 v 8.8.3
   - Fix gitlab importer failing to import new projects due to missing credentials
+  - Fix import URL migration not rescuing with the correct Error
 
 v 8.8.2
   - Added remove due date button. !4209

db/migrate/20160302152808_remove_wrong_import_url_from_projects.rb

@@ -28,7 +28,7 @@ class RemoveWrongImportUrlFromProjects < ActiveRecord::Migration
 
         update_import_url(import_url, project)
         update_import_data(import_url, project)
-      rescue URI::InvalidURIError
+      rescue Addressable::URI::InvalidURIError
         nullify_import_url(project)
       end
     end