Classroom asset: poly_count issue

[feniksa]

Issue

1. Classroom asset doesn't render correctly (issues with emissive mat)
2. Denoiser step doesn't work at all with error poly_count issue

Steps to Reproduce

1. Open Kitchen Demo scene](https://download.blender.org/demo/test/classroom.zip)
2. Enable denoiser
3. Render

System Setup (Environment)

Windows10
RX6800XT
Blender 4.1
GPU Render

Detailed Description

2024-03-24 18:00:00,774 ERROR rpr.init [77492]: 'Instance' object has no attribute 'poly_count' EXCEPTION: Traceback (most recent call last):
File "C:\Users\msditanov\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\rprblender_init_.py", line 141, in render
self.engine.render()
File "C:\Users\msditanov\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\rprblender\engine\render_engine.py", line 575, in render
self._render()
File "C:\Users\msditanov\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\rprblender\engine\render_engine_2.py", line 106, in _render
super()._render()
File "C:\Users\msditanov\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\rprblender\engine\render_engine.py", line 332, in _render
self.athena_send(athena_data)
File "C:\Users\msditanov\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\rprblender\engine\render_engine.py", line 842, in athena_send
data['Num Polygons'] = sum(
File "C:\Users\msditanov\AppData\Roaming\Blender Foundation\Blender\4.0\scripts\addons\rprblender\engine\render_engine.py", line 843, in
(o.mesh.poly_count if isinstance(o, pyrpr.Instance) else o.poly_count)
AttributeError: 'Instance' object has no attribute 'poly_count'