maxsem@tin:/a/common$ mwscript extensions/Translate/scripts/ttmserver-export.php --wiki=metawiki

[snip]
18156 1623.97 25.0M Forked thread 20340 to handle Centralnotice-tgroup-B13_0724_mobile_dropdown_staged_enGB
Empty $mTitle in OutputPage::parse
Backtrace:
#0 /a/common/php-1.22wmf11/extensions/CentralNotice/includes/Banner.php(64): OutputPage->parse('{{MediaWiki:FR2...')
#1 /a/common/php-1.22wmf11/extensions/CentralNotice/includes/BannerMessageGroup.php(42): Banner->extractMessageFields()
#2 /a/common/php-1.22wmf11/extensions/Translate/messagegroups/MessageGroupOld.php(300): BannerMessageGroup->getDefinitions()
#3 /a/common/php-1.22wmf11/extensions/Translate/utils/MessageGroupStats.php(374): MessageGroupOld->initCollection('aa')
#4 /a/common/php-1.22wmf11/extensions/Translate/utils/MessageGroupStats.php(327): MessageGroupStats::calculateGroup(Object(BannerMessageGroup), 'aa')
#5 /a/common/php-1.22wmf11/extensions/Translate/utils/MessageGroupStats.php(265): MessageGroupStats::forItemInternal(Array, Object(BannerMessageGroup), 'aa')
#6 /a/common/php-1.22wmf11/extensions/Translate/utils/MessageGroupStats.php(114): MessageGroupStats::forGroupInternal(Object(BannerMessageGroup))
#7 /a/common/php-1.22wmf11/extensions/Translate/scripts/ttmserver-export.php(118): MessageGroupStats::forGroup('Centralnotice-t...')
#8 /a/common/php-1.22wmf11/extensions/Translate/scripts/ttmserver-export.php(84): TTMServerBootstrap->exportGroup(Object(BannerMessageGroup))
#9 /a/common/php-1.22wmf11/maintenance/doMaintenance.php(115): TTMServerBootstrap->execute()
#10 /a/common/php-1.22wmf11/extensions/Translate/scripts/ttmserver-export.php(166): require_once('/a/common/php-1...')
#11 /a/common/multiversion/MWScript.php(97): require_once('/a/common/php-1...')
#12 {main}

Very easy to repro on testwiki.

Version: master
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=52148