sport tags without feature tags should not create POIs

[Hufkratzer]

The tiles contain entries like:

which comes from https://www.openstreetmap.org/way/299045146.
It appears on maptiler.com like this:

The value for class comes from a sport tag because a feature tag (leisure=sports_centre) is missing, compare https://wiki.openstreetmap.org/wiki/Key:sport

Carto and most other maps I know don't render such incompletely tagged objects. JOSM gives a warning "sport without physical feature". I doubt that the tiles should contain such entries. If they do appear on maps, mappers might conclude that this is correct tagging.

[TomPohys]

Hi, thanks for the comment. I understand that the majority of sports have also a physical tag. In the wiki there is: "Since this is a non-physical tag it should be combined with one of these (physical) tags." From taginfo, there are 99.02% combinations sport=tennis and leisure=*. So the 0.92% (approx 4725 sport=tennis) do not have a physical tag.

PR is welcome.