Add error boundary on node.DrawBackground (#311)

Author: huchenlei

src/scripts/app.ts

@@ -657,7 +657,7 @@ export class ComfyApp {
       }
     }
 
-    node.prototype.onDrawBackground = function (ctx) {
+    function unsafeDrawBackground(ctx) {
       if (!this.flags.collapsed) {
         let imgURLs = []
         let imagesChanged = false
@@ -992,6 +992,14 @@ export class ComfyApp {
         }
       }
     }
+
+    node.prototype.onDrawBackground = function (ctx) {
+      try {
+        unsafeDrawBackground.call(this, ctx)
+      } catch (error) {
+        console.error('Error drawing node background', error)
+      }
+    }
   }
 
   /**