Fix brush broken in part 6

Author: Keavon

editor/src/messages/portfolio/portfolio_message_handler.rs

@@ -485,7 +485,6 @@ impl MessageHandler<PortfolioMessage, PortfolioMessageData<'_>> for PortfolioMes
 					("graphene_core::raster::GradientMapNode", "graphene_core::raster::adjustments::GradientMapNode"),
 					("graphene_core::raster::HueSaturationNode", "graphene_core::raster::adjustments::HueSaturationNode"),
 					("graphene_core::raster::InvertNode", "graphene_core::raster::adjustments::InvertNode"),
-					// ("graphene_core::raster::IndexNode", "graphene_core::raster::adjustments::IndexNode"),
 					("graphene_core::raster::InvertRGBNode", "graphene_core::raster::adjustments::InvertNode"),
 					("graphene_core::raster::LevelsNode", "graphene_core::raster::adjustments::LevelsNode"),
 					("graphene_core::raster::LuminanceNode", "graphene_core::raster::adjustments::LuminanceNode"),

node-graph/gstd/src/brush.rs

@@ -185,10 +185,11 @@ pub fn blend_with_mode(background: Instance<Image<Color>>, foreground: Instance<
 
 #[node_macro::node(category("Raster"))]
 async fn brush(_: impl Ctx, mut image_frame_table: RasterDataTable<Color>, strokes: Vec<BrushStroke>, cache: BrushCache) -> RasterDataTable<Color> {
+	if image_frame_table.is_empty() {
+		image_frame_table.push(Instance::default());
+	}
 	// TODO: Find a way to handle more than one instance
-	let Some(image_frame_instance) = image_frame_table.instance_ref_iter().next() else {
-		return RasterDataTable::default();
-	};
+	let image_frame_instance = image_frame_table.instance_ref_iter().next().expect("Expected the one instance we just pushed");
 	let image_frame_instance = image_frame_instance.to_instance_cloned();
 
 	let [start, end] = image_frame_instance.clone().to_table().bounding_box(DAffine2::IDENTITY, false).unwrap_or([DVec2::ZERO, DVec2::ZERO]);