Handle errors when loading manifest icons.

Wrap the `loadResource` call in a try-catch block to gracefully handle cases where an icon cannot be loaded, returning `null` instead of throwing an error.

Bug: 492211941
Change-Id: I050af476d0b54cc3582e871647484d2e977cabb8
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7681550
Auto-Submit: Danil Somsikov <dsv@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>

Author: danilsomsikov

front_end/panels/application/AppManifestView.ts

@@ -1354,13 +1354,19 @@ export class AppManifestView extends Common.ObjectWrapper.eventMixin<EventTypes,
     if (!frameId) {
       throw new Error('no main frame found');
     }
-    const {content} = await SDK.PageResourceLoader.PageResourceLoader.instance().loadResource(
-        url, {
-          target: this.target,
-          frameId,
-          initiatorUrl: this.target.inspectedURL(),
-        },
-        /* isBinary=*/ true);
+    let content;
+    try {
+      const response = await SDK.PageResourceLoader.PageResourceLoader.instance().loadResource(
+          url, {
+            target: this.target,
+            frameId,
+            initiatorUrl: this.target.inspectedURL(),
+          },
+          /* isBinary=*/ true);
+      content = response.content;
+    } catch {
+      return null;
+    }
     // Just loading the image, not building UI.
     /* eslint-disable @devtools/no-imperative-dom-api */
     const image = document.createElement('img');