Update AbuseFilter for MW 1.33.
[5c25356c3afacbcbff7db5ca] /Special:Upload TypeError from line 3028 of extensions/AbuseFilter/includes/AbuseFilter.php: Argument 1 passed to AbuseFilter::contentToString() must be an instance of Content, null given, called in extensions/AbuseFilter/includes/AbuseFilterHooks.php on line 800
Backtrace:
#0 extensions/AbuseFilter/includes/AbuseFilterHooks.php(800): AbuseFilter::contentToString(NULL)
#1 extensions/AbuseFilter/includes/AbuseFilterHooks.php(728): AbuseFilterHooks::filterUpload(string, UploadFromFile, User, array, string, boolean, NULL)
#2 includes/Hooks.php(174): AbuseFilterHooks::onUploadVerifyUpload(UploadFromFile, User, array, string, boolean, NULL)
#3 includes/Hooks.php(202): Hooks::callHook(string, array, array, NULL)
#4 includes/upload/UploadBase.php(849): Hooks::run(string, array)
#5 includes/specials/SpecialUpload.php(568): UploadBase->performUpload(string, boolean, boolean, User, array)
#6 includes/specials/SpecialUpload.php(204): SpecialUpload->processUpload()
#7 includes/specialpage/SpecialPage.php(569): SpecialUpload->execute(NULL)
#8 includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(NULL)
#9 includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#10 includes/MediaWiki.php(865): MediaWiki->performRequest()
#11 includes/MediaWiki.php(515): MediaWiki->main()
#12 index.php(42): MediaWiki->run()
#13 {main}