Git commits in Moodle 2.5.1 by Dmytro Vorona

commit 0927af1e8dc90155a705da19b621a33dfee9db6f
Author: Dmytro Vorona <alendit@gmail.com>
Date:   Mon, 25 Mar 2013 21:19:25 +0800
Tag:    v2.5.1

MDL-40297 Hide empty categories in my courses

commit 02e1c8ad20bbffb7a94eb68f8908e214036a5494
Author: Dmytro Vorona <alendit@gmail.com>
Date:   Mon, 25 Mar 2013 17:57:31 +0800
Tag:    v2.5.1

MDL-38631 Fixed faulty add_category call, introduced in 758103