fix: Fail test on CRAN [Urgent]

[ColinFay]

Dear maintainer,

Please see the problems shown on https://cran.r-project.org/web/checks/check_results_dockerfiler.html.

Please correct before 2023-01-24 to safely retain your package on CRAN.

It seems we need to remind you of the CRAN policy:

'Packages which use Internet resources should fail gracefully with an informative message if the resource is not available or has changed (and not give a check warning nor error).'

This needs correction whether or not the resource recovers.

The CRAN Team

[ColinFay]

Once corrected, link with https://github.com/ThinkR-open/checkhelper/issues/27