fix: try catching icon read errors before stream

Current issue with get-launch-apps wasn't fixed by catching errors while
reading the stream so this next attempt catches errors from the call to
start reading.

If the error occurs asynchronously this may not work either.

src/backend/src/services/AppIconService.js

@@ -84,7 +84,8 @@ class AppIconService extends BaseService {
         const dir_app_icons = await this.get_app_icons();
         console.log('APP UID', app_uid);
         const node = await dir_app_icons.getChild(`${app_uid}-${size}.png`);
-        if ( ! await node.exists() ) {
+
+        const get_fallback_icon = async () => {
             // Use database-stored icon as a fallback
             app_icon = app_icon ?? await (async () => {
                 const app = await get_app({ uid: app_uid });
@@ -100,15 +101,26 @@ class AppIconService extends BaseService {
             };
         }
 
-        const svc_su = this.services.get('su');
-        const ll_read = new LLRead();
-        return {
-            mime: 'image/png',
-            stream: await ll_read.run({
-                fsNode: node,
-                actor: await svc_su.get_system_actor(),
-            })
-        };
+        if ( ! await node.exists() ) {
+            return await get_fallback_icon();
+        }
+
+        try {
+            const svc_su = this.services.get('su');
+            const ll_read = new LLRead();
+            return {
+                mime: 'image/png',
+                stream: await ll_read.run({
+                    fsNode: node,
+                    actor: await svc_su.get_system_actor(),
+                })
+            };
+        } catch (e) {
+            this.errors.report('AppIconService.get_icon_stream', {
+                source: e,
+            });
+            return await get_fallback_icon();
+        }
     }
 
     /**