Fix return new instance list

src/settings.py

@@ -111,13 +111,16 @@ def get_new_funkwhale_servers():
             }
         ]
     }
-
-    r = requests.post(public_server_api, json=request_public_servers)
-    results = r.json()
-    new_instances = []
-    if results:
-        new_instances_list = results['results']['A']['tables'][0]['rows']
-        for i in new_instances_list:
-            if i[0] not in default_conf['public_list_instances'] and i[1]:
-                new_instances.append(i[0])
-    return new_instances
+    try:
+        r = requests.post(public_server_api, json=request_public_servers)
+        results = r.json()
+        new_instances = []
+        if results:
+            new_instances_list = results['results']['A']['tables'][0]['rows']
+            exists_instances = get_config('public_list_instances')
+            for i in new_instances_list:
+                if i[0] not in exists_instances and i[1]:
+                    new_instances.append(i[0])
+        return new_instances
+    except: # If any errors then return empty list
+        return []