Object.actor_link bug fix: handle composite url field

fixes https://console.cloud.google.com/errors/detail/CJTXq6ri48XtKQ;time=P30D?project=bridgy-federated

models.py

@@ -862,7 +862,7 @@ class Object(StringIdModel):
         elif set(actor.keys()) == {'id'}:
             return common.pretty_link(actor['id'], attrs=attrs)
 
-        url = util.get_first(actor, 'url') or ''
+        url = as1.get_url(actor)
         name = actor.get('displayName') or actor.get('username') or ''
         img_url = util.get_url(actor, 'image')
         if not image or not img_url:

tests/test_models.py

@@ -488,6 +488,18 @@ class ObjectTest(TestCase):
   Alice
 </a>""", obj.actor_link(sized=True))
 
+    def test_actor_link_composite_url(self):
+        obj = Object(id='x', our_as1={
+            'actor': {
+                'url': {
+                    'value': 'https://mas.to/@foo',
+                }
+            },
+        })
+        self.assert_multiline_equals(
+            '<a class="h-card u-author" href="https://mas.to/@foo">mas.to/@foo</a>',
+            obj.actor_link(image=False))
+
     def test_put_updates_load_cache(self):
         obj = Object(id='x', as2={})
         obj.put()