Gracefully handle failure to fetch h-x-app

lemonauth/views/tokens/list.py

@@ -1,3 +1,4 @@
+from requests import HTTPError
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.views.generic import TemplateView
 from typing import Dict, Optional, Set
@@ -20,10 +21,10 @@ class Client:
         self.id = client_id
         self.count = 0
         self.scopes = set()
-        apps = mf2(self.id).to_dict(filter_by_type="h-x-app")
         try:
+            apps = mf2(self.id).to_dict(filter_by_type="h-x-app")
             self.app = apps[0]["properties"]
-        except IndexError:
+        except (HTTPError, IndexError):
             self.app = None