Try to redirect /events/[monthWithNoEvent] to nearest future month with event

[sruenwg]

Fixes #642.

I went with option 1 described in #642, so if /events/[yearMonth] has no events, instead of showing a 404:

• The user is redirected to the month with the next upcoming event.
• If there is no such month after the queried month, the user is redirected to the last month prior to the queried month which had an event.
• A 404 is only shown when there are no events at all which could be fetched.

Tests

If the queried month has no event but there is an event in a future month, redirect to the closest future month with an event:

vspodule-no-event-month-redirect-future.mov

If the queried month has no event and there is an event only in a past month, redirect to the last month with an event:

vspodule-no-event-month-redirect-past.mov

If the queried month has an event, perform no redirect:

vspodule-no-event-month-redirect-present.mov

If fetched events list is empty, show 404:

vspodule-no-event-month-redirect-none.mov

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[sugar-cat7]

Thankyou🙏