Fix update when no internet.

Author: pierre-rouanet

src/reachy_mini/daemon/app/dashboard/static/js/update.js

@@ -3,9 +3,12 @@ const updateManager = {
     preRelease: false,
 
     isUpdateAvailable: async () => {
-        fetch('/update/available?pre_release=' + updateManager.preRelease)
-            .then(response => response.json())
-            .then(data => {
+        await fetch('/update/available?pre_release=' + updateManager.preRelease)
+            .then(async response => {
+                if (!response.ok) {
+                    return false;
+                }
+                const data = await response.json();
                 return data.update.reachy_mini;
             }).catch(error => {
                 console.error('Error checking for updates:', error);

src/reachy_mini/daemon/app/routers/update.py

@@ -6,6 +6,7 @@
 import logging
 import threading
 
+import requests
 from fastapi import APIRouter, HTTPException, WebSocket
 
 from reachy_mini.daemon.app import bg_job_register
@@ -29,7 +30,7 @@ def available(pre_release: bool = False) -> dict[str, dict[str, bool]]:
                 "reachy_mini": is_update_available("reachy_mini", pre_release),
             }
         }
-    except ConnectionError:
+    except (ConnectionError, requests.exceptions.ConnectionError):
         raise HTTPException(status_code=503, detail="Unable to check for updates")