Render the jobset page correctly when there are fetch errors

Dependencies

• [2] SS4TZXNU Distinguish between permanent evaluation errors and transient input errors
• [3] 4UUKWXDF Jobset page: Show last evaluation time
• [4] OX6NYJDV Split viewing and editing a jobset
• [*] ODNCGFQ5 * Improved the navigation bar: don't include all projects (since that

Change contents

• replacement in src/root/jobset.tt at line 122
  [3.8557]→[3.706:795](∅→∅)
  − <p>Errors occurred at [% INCLUDE renderDateTime timestamp=jobset.errortime %].</p>
  [3.8557]

  [2.667]
  + <p>Errors occurred at [% INCLUDE renderDateTime timestamp=(jobset.errortime || jobset.lastcheckedtime) %].</p>