Fix preview renderer error with no spawn animation

🙄

PreviewRenderer.js

@@ -65,7 +65,7 @@ export default class PreviewRenderer {
 
 			let animator = this.viewer.getModel().animator;
 			let animation = animations["animations"]["animation.armor_stand.hologram.spawn"];
-			Object.values(animation["bones"]).map(bone => Object.values(bone).forEach(animationChannel => {
+			Object.values(animation["bones"] ?? {}).map(bone => Object.values(bone).forEach(animationChannel => {
 				animationChannel[`${animation["animation_length"]}`] = animationChannel[`${max(...Object.keys(animationChannel))}`];
 			}));
 			animator.addAnimation("spawn", animations["animations"]["animation.armor_stand.hologram.spawn"]);

README.md

@@ -3,6 +3,9 @@
 ### About
 HoloPrint is a web app that converts MCBE structure files into resource packs showing holograms of builds. It builds off the work of [Structura](https://github.com/RavinMaddHatter/Structura), a similar project. Both Structura and HoloPrint aim to recreate the experience of Java Edition mods like [Litematica](https://github.com/maruohon/litematica) and [Schematica](https://github.com/Lunatrius/Schematica) for Bedrock Edition users through resource packs.
 
+> [!TIP]
+> View the [wiki](https://github.com/SuperLlama88888/holoprint/wiki/1.-Usage-instructions) for more detailed instructions!
+
 ### Usage
 > [!NOTE]
 > On Android the Structure Block export button is hidden; please use [this pack](assets/structureBlockButtonAdderPack.mcpack) to add it back.