From 52800f417356fe5b83c142ffcb207a770cddd314 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20P=C3=A9ters?= <fpeters@entrouvert.com>
Date: Tue, 25 Aug 2020 18:31:38 +0200
Subject: [PATCH] backoffice: don't crash previewing fields that fail to render
 (#46099)

---
 wcs/admin/forms.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/wcs/admin/forms.py b/wcs/admin/forms.py
index 5278734d3..3c4349e7e 100644
--- a/wcs/admin/forms.py
+++ b/wcs/admin/forms.py
@@ -876,7 +876,13 @@ class FormDefPage(Directory):
         for i, field in enumerate(self.formdef.fields):
             field.id = i
             if hasattr(field, str('add_to_form')):
-                field.add_to_form(form)
+                try:
+                    field.add_to_form(form)
+                except Exception as e:
+                    form.widgets.append(HtmlWidget(htmltext(
+                        '<div class="errornotice"><p>%s (%s)</p></div>') % (
+                            _('Error previewing field.'),
+                            e)))
             else:
                 if field.key == 'page':
                     if on_page: