Fixed critical bug where new canvases throw error

Author: Developer-Mike

manifest.json

@@ -1,7 +1,7 @@
 {
 	"id": "advanced-canvas",
 	"name": "Advanced Canvas",
-	"version": "2.7.1",
+	"version": "2.7.2",
 	"minAppVersion": "1.1.0",
 	"description": "Supercharge your canvas experience! Create presentations, flowcharts and more!",
 	"author": "Developer-Mike",

src/core/canvas-patcher.ts

@@ -45,7 +45,7 @@ export default class CanvasPatcher {
       },
       setViewData: (next: any) => function (json: string, ...args: any) {
         const result = next.call(this, json, ...args)
-        this.canvas.metadata = JSON.parse(json).metadata
+        this.canvas.metadata = JSON.parse(json)?.metadata ?? {}
 
         that.triggerWorkspaceEvent(CanvasEvent.CanvasChanged, this.canvas)