fix(xo-web/health): fix "an error has occurred" (#6508)

CHANGELOG.unreleased.md

@@ -19,6 +19,7 @@
 
 - [Pool] Add tooltip on "no XCP-ng Pro support" warning icon (PR [#6505](https://github.com/vatesfr/xen-orchestra/pull/6505))
 - [Backup] Respect HTTP proxy setting when connecting to XCP-ng/XenServer pools
+- [Dashboard/Health] Fix `an error has occurred` in case of unknown default SR (PR [#6508](https://github.com/vatesfr/xen-orchestra/pull/6508))
 
 ### Packages to release
 

packages/xo-web/src/xo-app/dashboard/health/index.js

@@ -634,7 +634,12 @@ export default class Health extends Component {
         const nbHostsPerPool = countBy(hosts, host => host.$pool)
         return filter(selectedPools, pool => {
           const { default_SR } = pool
-          return default_SR !== undefined && !userSrs[default_SR].shared && nbHostsPerPool[pool.id] > 1
+          return (
+            default_SR !== undefined &&
+            userSrs[default_SR] !== undefined &&
+            !userSrs[default_SR].shared &&
+            nbHostsPerPool[pool.id] > 1
+          )
         })
       }
     )