skip_if_empty not honored if set to False

[tkeffer]

If skip_if_empty is set to False in skin.conf, a plot should be shown even if it does not have any data in it. Unfortunately, it is not. A plot is generated, but it is not shown.

The reason is that index.html.tmpl uses $recent.check_for_data to decide whether to show a plot, which only checks whether there is any data in the database, not whether skip_if_empty might be False.

[github-actions]

This issue is stale because it has been open for 180 days with no activity.