Fix T51855: Cycles emssive objects with NaN transform break lighting.

Referenced by issue #51855, Object NaN translation data objects renders lights not illuminating the scene with Cycles

intern/cycles/render/light.cpp

@@ -224,6 +224,10 @@ void LightManager::disable_ineffective_light(Device *device, Scene *scene)
 
 bool LightManager::object_usable_as_light(Object *object) {
 	Mesh *mesh = object->mesh;
+	/* Skip objects with NaNs */
+	if (!object->bounds.valid()) {
+		return false;
+	}
 	/* Skip if we are not visible for BSDFs. */
 	if(!(object->visibility & (PATH_RAY_DIFFUSE|PATH_RAY_GLOSSY|PATH_RAY_TRANSMIT))) {
 		return false;