Git commits in Moodle 2.7.3 by sam marshall

commit 805122a72f016856b88a867971c823d099e5c7a0
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Thu, 02 Oct 2014 17:39:20 +0800
Tag:    v2.7.3

MDL-47481 Availability: Profile condition error if no users


commit eb2e5d8a836ddb34cc7ad7c34707d15005be77e9
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Wed, 24 Sep 2014 19:04:48 +0800
Tag:    v2.7.3

MDL-42974 UI: Modal dialogs do not work in IE8


commit dea57f01076686e7683bcdbe9434d129b2034fcf
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Tue, 23 Sep 2014 19:09:03 +0800
Tag:    v2.7.3

MDL-47380 Availability: Editing interface broken in IE8


commit 0e290bc008b76ac75fd142526045460b1580d445
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Thu, 18 Sep 2014 19:59:19 +0800
Tag:    v2.7.3

MDL-47322 Availability: empty availability should be saved as null


commit 81c4057908f1d3279a1633bd3523b98ee3f8179f
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Sat, 30 Aug 2014 01:51:18 +0800
Tag:    v2.7.3

MDL-46991 Availability: Conditional dates not updated on restore