The `phabricator:20150503.repositorysymbols.2.php` migration triggers a notice, when migrated arcanist project don't have a repository association:
```
Applying patch 'phabricator:20150503.repositorysymbols.1.sql'...
Applying patch 'phabricator:20150503.repositorysymbols.2.php'...
[2015-06-01 08:38:28] ERROR 8: Undefined index: repository at [/home/sites/phabricator/web/phabricator/resources/sql/autopatches/20150503.repositorysymbols.2.php:14]
arcanist(head=master, ref.master=7b891cd13e70), phabricator(head=master, ref.master=b13171566df9), phutil(head=master, ref.master=ee6d0c3fe26e)
#0 require_once(string) called at [<phabricator>/src/infrastructure/storage/management/PhabricatorStorageManagementAPI.php:226]
#1 PhabricatorStorageManagementAPI::applyPatchPHP(string) called at [<phabricator>/src/infrastructure/storage/management/PhabricatorStorageManagementAPI.php:191]
#2 PhabricatorStorageManagementAPI::applyPatch(PhabricatorStoragePatch) called at [<phabricator>/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementUpgradeWorkflow.php:190]
#3 PhabricatorStorageManagementUpgradeWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:406]
#4 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:301]
#5 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/sql/manage_storage.php:176]
Applying patch 'phabricator:20150503.repositorysymbols.3.sql'...
```