misc: give search renderer all context variables (#28093)

combo/data/models.py

@@ -683,9 +683,14 @@ class CellBase(six.with_metaclass(CellMeta, models.Model)):
             return ''
         if not self.is_visible(user=None):
             return ''
+        request = RequestFactory().get(self.page.get_online_url())
+        request.user = None  # compat
         context = {
+            'page': self.page,
+            'render_skeleton': False,
+            'request': request,
+            'site_base': request.build_absolute_uri('/')[:-1],
             'synchronous': True,
-            'request': RequestFactory().get(self.page.get_online_url()),
             'user': None, # compat
         }
         if not self.is_relevant(context):