When setting attribute, make sure we always call HAPI_AddAttribute()
When setting attribute, make sure we always call HAPI_AddAttribute()

Even when the count is zero, we still need to call HAPI_AddAttribute().
This is needed to clear out any existing data that was left over from
the previous input geometry.

sideeffects/HoudiniEngineForMaya,sideeffects/HoudiniEngineForMaya,sideeffects/HoudiniEngineForMaya