fix: fix incorrect setting of "archived" status for events of course

[Alphajax]

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🤔 This is a ...

• New feature
• Bug fix
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issue

💡 Background and solution

Describe the big picture of your changes here
changed logic of getEventStatus function at CourseScheduleService
check if endDate exists before compare it with current date

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[AlreadyBored]

Btw I am not sure this is correct. After conversion to number left part of this expression will never be null or undefined, so right part will not work, I think proper version looks like this, could you please fix it?

Suggested change

	const endTime = Number(courseEvent.endTime) ?? startTime + (courseEvent.duration ?? 60) * 1000 * 60;
	const endTime = Number(courseEvent.endTime) || startTime + (courseEvent.duration ?? 60) * 1000 * 60;