Developer credits
Git commits in Moodle 2.5.x by Kyle Temkin
commit 11f6680deec05ae45aa563c8956dbd9adf1a0f53 Author: Kyle Temkin <ktemkin@binghamton.edu> Date: Thu, 20 Jun 2013 11:31:01 +0800 Tag: v2.5.1 MDL-40264 fix essay handling of zero-string response