allotrope panel content broken

[egonw]

Describe the bug
When going to the page of carbon, I expect to see a list of allotropes of carbon (diamond, graphene, graphite, etc). But the table is empty.

Possible cause is a change of the model, following the deprecation of the "of" property, e.g. see https://www.wikidata.org/w/index.php?title=Q622460&diff=2382847968&oldid=2382847846&diffmode=source

To Reproduce
Steps to reproduce the behavior:

1. Go to https://scholia.toolforge.org/chemical-element/Q623
2. Scroll down to 'Allotropes'
3. See an empty table

Expected behavior
The table should list at least diamond, graphite, graphene.