config.rowTemplate is set but carries no template string; the card presentation is off. Supply rowTemplate: '<div>{{data.name}}</div>' or { template: '…' }.

Warnings reference › rowTemplate.missing

Identifier

rowTemplate.missing

Raised by

The grid (rendering)

Since

1.6.0

What happened

rowTemplate was configured with no template to draw. The card presentation is refused outright and the grid stays a table - a presentation that drew nothing would look like a broken grid and be reported as one.

The fix

Pass the template as a string, or as { template: '…' }.

Reference

Covered in full at the API reference.