Delete the previous content, like a 'time out' error message

[egonw]

Fixes #2560

Description

This patch resets the content of the HTML table element, e.g. the <p> element with a 'time out' error message.

Caveats

It looks that it does the right thing, e.g. for the test page in the bug report.

Check any of the following which apply:

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

Testing

From the bug report:

• https://scholia.toolforge.org/authors/Q21264190,Q30103188,Q43200797,Q51366847,Q53103589,Q54806715,Q112275836,Q56447936,Q57062249,Q57225833,Q57243435,Q57302902,Q57552918,Q61044058,Q61665725,Q63865447,Q88152670,Q90750787,Q92675346,Q95981554,Q101086361,Q102429134,Q102430988,Q102552081,Q108730193,Q111394757

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)

[fnielsen]

I am still getting the problem.

[Daniel-Mietchen]

Seems to work fine now.

[egonw]

@fnielsen, can you plz tell me what you expect me to do?