Attempt to avoid a warning I got during input:

Attempt to avoid a warning I got during input:

$ 7z x -so ../dewikisource-20111012-pages-meta-history.xml.7z | php maintenance/importDump.php

7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)

Processing archive: ../dewikisource-20111012-pages-meta-history.xml.7z

Extracting  dewikisource-20111012-pages-meta-history.xml
PHP Notice:  Undefined index: wgExtensionAliasesFiles in /home/mah/work/code/mediawiki/mw-
svn/includes/cache/CacheDependency.php on line 386
PHP Stack trace:
PHP   1. {main}() /home/mah/work/code/mediawiki/mw-svn/maintenance/importDump.php:0
PHP   2. require_once() /home/mah/work/code/mediawiki/mw-svn/maintenance/importDump.php:287
PHP   3. BackupReader->execute() /home/mah/work/code/mediawiki/mw-svn/maintenance/doMaintenance.php:105
PHP   4. BackupReader->importFromStdin() /home/mah/work/code/mediawiki/mw-svn/maintenance/importDump.php:93
PHP   5. BackupReader->importFromHandle() /home/mah/work/code/mediawiki/mw-svn/maintenance/importDump.php:249
PHP   6. WikiImporter->doImport() /home/mah/work/code/mediawiki/mw-svn/maintenance/importDump.php:282
PHP   7. WikiImporter->handlePage() /home/mah/work/code/mediawiki/mw-svn/includes/Import.php:411
PHP   8. WikiImporter->processTitle() /home/mah/work/code/mediawiki/mw-svn/includes/Import.php:534
PHP   9. Title->userCan() /home/mah/work/code/mediawiki/mw-svn/includes/Import.php:788
PHP  10. Title->getUserPermissionsErrorsInternal() /home/mah/work/code/mediawiki/mw-svn/includes/Title.php:1557
PHP  11. Title->checkSpecialsAndNSPermissions() /home/mah/work/code/mediawiki/mw-svn/includes/Title.php:2118
PHP  12. Title->getNsText() /home/mah/work/code/mediawiki/mw-svn/includes/Title.php:1728
PHP  13. Language->needsGenderDistinction() /home/mah/work/code/mediawiki/mw-svn/includes/Title.php:723
PHP  14. LocalisationCache->getItem() /home/mah/work/code/mediawiki/mw-svn/languages/Language.php:442
PHP  15. LocalisationCache->loadItem() /home/mah/work/code/mediawiki/mw-svn/includes/LocalisationCache.php:218
PHP  16. LocalisationCache->initLanguage() /home/mah/work/code/mediawiki/mw-svn/includes/LocalisationCache.php:283
PHP  17. LocalisationCache->isExpired() /home/mah/work/code/mediawiki/mw-svn/includes/LocalisationCache.php:395
PHP  18. GlobalDependency->isExpired() /home/mah/work/code/mediawiki/mw-svn/includes/LocalisationCache.php:367