INQ: Exporting parameters with empty values

### Inquiry description

Hello,

is there a way to export parameters with empty values?

If not maybe a swithc in IFC setting culd do the trick.

### Revit Version

2026.4.x

### IFC for Revit Addon Version

26.4.1

### Windows Version

11 25H2

The issue names no file, test, or entry point. Start by locating IFC export parameter handling and existing IFC settings, then clarify whether empty values should be exported and how a setting would control that behavior; done requires an agreed scope and verified export behavior.

Written by the indexing model from the issue text.