Fix timetable generation for StopTimeUpdate containing only arrival or departure #6392
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Summary
The GTFS-RT specification does not require both arrival and departure to be provided for a TripUpdate, only either of them is enough. This fixes NEGATIVE_DWELL_TIME or NEGATIVE_HOP_TIME resulting from these updates as they were not processed correctly.
Issue
Closes #6391
Unit tests
Added
Documentation
None needed
Changelog
Bumping the serialization version id
None needed