Should not show '1970' if bad data comes back for an extension date

[holly-cummins]

See, for example (for the moment), https://quarkus.io/extensions/io.quarkiverse.ironjacamar/quarkus-ironjacamar

I assume we're getting a 0 for the date, but we should turn that into an undefined and display nothing.

Edit:

There are two parts to the fix:

• detect 0 dates and do not render them (Do not render '0' dates #341)
• detect cases where a date is too small by a factor of 1000, and correct

[holly-cummins]

In this particular case, it looks like the timestamp is out by a factor of a thousand. That's harder to detect, and I'm not entirely sure what would cause it. We could try and detect the situation and multiply dates by a thousand if they seem too small, but I think before we invest in that we want to understand why this is happening.