Course chapters not accessible in module view

[PasiSa]

In the course module view the sub-chapters are shown as not accessible even though they should, see for example here in A+ manual. This seems to relate to the recent modification that applies revel rules to course chapters, and uses the new is_revealed attribute when deciding on chapter accessibility.

This is particularly harmful in situations when a course module is linked as LTI activity (e.g. from MyCourses), because the chapters in the module have become unaccessible.