backoffice: fix breadcrumb to card when using custom views (#46041)

wcs/backoffice/data_management.py

@@ -84,15 +84,11 @@ class CardPage(FormPage):
                   ('import-csv', 'import_csv'),
                   ('data-sample-csv', 'data_sample_csv')]
     admin_permission = 'cards'
+    formdef_class = CardDef
 
-    def __init__(self, component=None, formdef=None, view=None):
-        try:
-            self.formdef = formdef if formdef else CardDef.get_by_urlname(component)
-        except KeyError:
-            raise errors.TraversalError()
-        self.add = CardFillPage(self.formdef.url_name)
-        if view:
-            self.view = view
+    @property
+    def add(self):
+        return CardFillPage(self.formdef.url_name)
 
     def can_user_add_cards(self):
         if not self.formdef.backoffice_submission_roles:

wcs/backoffice/management.py

@@ -1029,12 +1029,13 @@ class FormPage(Directory):
                   ('save-view', 'save_view'), ('delete-view', 'delete_view'),]
     view = None
     admin_permission = 'forms'
+    formdef_class = FormDef
 
     def __init__(self, component=None, formdef=None, view=None):
         self.view_type = None
         if component:
             try:
-                self.formdef = FormDef.get_by_urlname(component)
+                self.formdef = self.formdef_class.get_by_urlname(component)
             except KeyError:
                 raise errors.TraversalError()
             get_response().breadcrumb.append((component + '/', self.formdef.name))