Blender Git Loki

Fix T86884: Don't remove the "line art object add" enum item

We would not add the "object line art" enum to the operator enum list,
if there were no active object in the scene.

This would make it impossible to call this operator from python code as
the enum would we hidden when we were not in a viewport context.

Always make the operator available, having no active object is not a
strict requirement for the operator to work, so expose it always.