JBM OSBA: the gains for the discrete objects are not computed

Basic info

• Commit SHA: 87c1c752
• Platform: all

Bug description

In the case of discrete objects in the OSBA format, the gains are never computed because of missing clauses for the different OSBA renderer types in the ISM JBM digest function.

Ways to reproduce

(Clear steps or refer to a failing automated test, e.g. with a pipeline link)