Git commits in Moodle 3.8.9 by Paul Holden

commit 2a10e1c6b0981b15d6fdc3bb5bbd66f7e735c0fe
Author: Paul Holden <paulh@moodle.com>
Date:   Sat, 17 Apr 2021 03:49:23 +0800
Tag:    v3.8.9

MDL-71359 mod_forum: empty forums shouldn't export anything.

commit c4106464c608a219a4f0d5b4915c67dce9ac279e
Author: Paul Holden <paulh@moodle.com>
Date:   Wed, 17 Mar 2021 04:55:12 +0800
Tag:    v3.8.9

MDL-71130 quiz_grading: escape user idnumber on display.

commit f49cb04ca5c56aebacb43497ba56536b2a1c78ae
Author: Paul Holden <paulh@moodle.com>
Date:   Tue, 02 Feb 2021 04:26:18 +0800
Tag:    v3.8.9

MDL-70763 core: export preferences for correct user.

commit a305ee2485f84910b474f7613a013cffe8af450e
Author: Paul Holden <paulh@moodle.com>
Date:   Fri, 15 Jan 2021 06:36:53 +0800
Tag:    v3.8.9

MDL-70763 quiz_overview: export preferences for correct user.

commit e313b4b446e03b34b2a7079bf7619ebb3660c300
Author: Paul Holden <paulh@moodle.com>
Date:   Fri, 15 Jan 2021 06:26:21 +0800
Tag:    v3.8.9

MDL-70763 gradereport_grader: export preferences for correct user.