fix: badly formatted string

cubicweb_saem_ref/views/authorityrecord.py

@@ -823,7 +823,7 @@ class AuthorityRecordGraphView(EntityView):
         for child_rel in entity.reverse_hierarchical_parent:
             for child in child_rel.hierarchical_child:
                 nprops = _node(child)
-                hiera_list += u'<li></li>'.format(nprops['title'])
+                hiera_list += u'<li>{}</li>'.format(nprops['title'])
         hiera_list += tags_closure
         self.w(hiera_list)
         domid = make_uid()