SqlBagOStuff::getMulti currently returns an array with false values for missed
cache keys.
Default BagOStuff::getMulti (and other specific implementations like memcached),
however, just omit missed values.
e.g.:
$cache->getMulti( array( 'goodkey' 'badkey' ) );
should return
array( 'goodkey' => 'value' );
instead of
array( 'goodkey' => 'value', 'badkey' => false );
Bug: 65637
Change-Id: Ib2de06a0f76421094707f7ad4218346087f4dc55
63b22fe634