Fix fatal introduced in r97296. Seems to happen only after restarting memcached.

Fix fatal introduced in r97296. Seems to happen only after restarting memcached.

( ! ) Fatal error: Unsupported operand types in /srv/org/wikimedia/prototype/wikis/rl2/languages/Language.php on line 479
Call Stack
#	Time	Memory	Function	Location
1	0.0002	121976	{main}( )	../index.php:0
2	0.0082	2959136	MediaWiki->run( )	../index.php:58
3	0.0082	2959136	MediaWiki->main( )	../Wiki.php:531
4	0.0082	2959136	MediaWiki->performRequest( )	../Wiki.php:612
5	0.0165	5012424	MediaWiki->performAction( )	../Wiki.php:252
6	0.0585	6947008	EditPage->submit( )	../Wiki.php:506
7	0.0585	6947008	EditPage->edit( )	../EditPage.php:360
8	0.1441	19979552	EditPage->showEditForm( )	../EditPage.php:512
9	0.1704	22610032	EditPage->showStandardInputs( )	../EditPage.php:1574
10	0.1778	22627752	Skin::makeInternalOrExternalUrl( )	../EditPage.php:2046
11	0.1778	22627752	Skin::makeUrl( )	../Skin.php:1006
12	0.1779	22627752	Skin::checkTitle( )	../Skin.php:991
13	0.1780	22627752	Title::newFromText( )	../Skin.php:1050
14	0.1780	22627752	Title->secureAndSplit( )	../Title.php:148
15	0.1780	22627752	Language->getNsIndex( )	../Title.php:2718
16	0.1781	22627752	Language->getNamespaceIds( )	../Language.php:530
17	0.1782	22627752	Language->getNamespaceAliases( )	../Language.php:505