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Fix for issue #197.
Bug: When creating a single activity course with moodleoverflow and going to "participant" within the course, an error occurs.
Problem: The lib function
moodleoverflow_extend_settings_navigation
uses the$PAGE
variable to access certain variables like the context or the instance id of moodleoverflow. This does not work apparently, as a null exception is throwed.Solution: Instead of using the global variable $PAGE, the function now uses a "local" page variable from the function parameter
$settingsnav
(The page variable is retrieved with$settingsnav->get_page()
). This approach is used by other moodle plugin like the ratingallocate plugin from Learnweb.