Git commits in Moodle 3.5.x by Eric Merrill

commit 85fec2b60535734bb7a622c15108a489f29458bb
Author: Eric Merrill <merrill@oakland.edu>
Date:   Wed, 23 Jan 2019 10:40:12 +0800
Tag:    v3.5.5

MDL-64609 gradebook: Prevent infinite loop in regrading

commit f55f89162dc08c1815aa4585aa536379209db5bf
Author: Eric Merrill <merrill@oakland.edu>
Date:   Tue, 09 Oct 2018 03:46:28 +0800
Tag:    v3.5.3

MDL-63456 qtype_multichoice: Return a default options object if missing

commit 2d5d5d79027ad430c8cc8ad7b30fd9059e4125f9
Author: Eric Merrill <merrill@oakland.edu>
Date:   Wed, 26 Sep 2018 11:35:37 +0800
Tag:    v3.5.3

MDL-63456 question: Improve Aiken error handling and multichoice errors

commit 815c44ce076ed407ec21dfda5b6ab0fbfd91240f
Author: Eric Merrill <merrill@oakland.edu>
Date:   Tue, 10 Apr 2018 02:47:50 +0800
Tag:    v3.5.0-beta

MDL-61913 restore: Protect against blocks that aren't being created