print less formatting errors in timesHEADmain

these used to go wrong in case there was no real-time info on departure
times. Instead traveltext now falls back on scheduled departure times if
no real-time info is available.

These still fail sometimes (at exit-only stops both appear to be unset
on the oebb hafas), but it's a lot better than what was before.

Also I've observed travelynx returning actual null values for missing
time stamps now, so the old hack of checking if timestamp = unix epoch
and considering that "unknown" might no longer be necessary, but I'm
keeping it around just in case.

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