Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  f405895925805666ece2d4b96606aab3c8c45413

Cleanup some warnings

The MemcachedPeclBagOStuff can return false from getMulti,
adjust our calling code to accept that retval.

Change-Id: I2219e5a17da14004a9ebaf8ee2052151380ba22c