getConfiguration: Don't bail when a valid variable is set null
authorErik Bernhardson <ebernhardson@wikimedia.org>
Thu, 21 Sep 2017 19:18:57 +0000 (12:18 -0700)
committerErik Bernhardson <ebernhardson@wikimedia.org>
Thu, 21 Sep 2017 19:19:50 +0000 (12:19 -0700)
commit4eb0d2fdb567a11193bf7bad1b6aadb85d7c2f4a
tree4e2a918512900688bb0330259b116808c8cfbb6b
parentda4a98830bf715bdc7bac38d61dc5ec401d99285
getConfiguration: Don't bail when a valid variable is set null

isset() will return false with a value is null. Null is an acceptable
result for a configuration variable, so switch to array_key_exists.

Change-Id: I11a3feb07d2bdc7ee30975014db29365086f89bc
maintenance/getConfiguration.php