Fix update attachment

document_url/view/document_url_view.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <odoo>
-    <data>
         <template id="assets_backend" name="google_drive assets" inherit_id="web.assets_backend">
             <xpath expr="." position="inside">
                 <link rel="stylesheet" href="/document_url/static/src/css/url.css" type="text/css"/>
@@ -34,5 +33,4 @@
                 </form>
             </field>
         </record>
-    </data>
 </odoo>

document_url/wizard/document_url.py

@@ -19,7 +19,9 @@ class AddUrlWizard(models.TransientModel):
     @api.multi
     def action_add_url(self):
         """Adds the URL with the given name as an ir.attachment record."""
-
+        
+        if not self._context.get('active_model'):
+            return
         for form in self:
             url = urlparse(form.url)
             if not url.scheme: