Fix channel-details not shown (openhab#1785)

Fixes openhab#1784.

Also-by: Florian Hotze <florianh_dev@icloud.com>
Signed-off-by: Jan N. Klug <github@klug.nrw>

bundles/org.openhab.ui/web/src/pages/settings/things/channel/channel-edit.vue

@@ -57,8 +57,9 @@ export default {
         this.configDescription = ct
         this.ready = true
       }).catch((err) => {
-        if (err === 404) {
+        if (err === 'Not Found' || err === 404) {
           this.noConfig = true
+          this.ready = true
         }
       })
     },