Summary:
src/infrastructure/javelin/markup.php phabricator_form() performs a strcasecmp() operation on an optional attribute withoiut checking to see if it exists first. This causes an 'Passing null to parameter #1 ($string1) of type string is deprecated' error.
Because we subsequenly check to see that the value equals /POST/i, all we need to do is check that the value has some 'true' value before doing the strcasecmp(). If it's not true, then it won't be POST!
Fixes T15509
Test Plan: View a diff. Eg: https://my.phorge.site/D1234
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15509
Differential Revision: https://we.phorge.it/D25319