Fix form validation for redirect action

Author: fsbraun

djangocms_form_builder/actions.py

@@ -56,6 +56,10 @@ def get_action_class(action):
     return _action_registry.get(action, None)
 
 
+def get_hash(action_class):
+    return hashlib.sha1(action_class.__name__.encode("utf-8")).hexdigest()
+
+
 class ActionMixin:
     """Adds action form elements to Form plugin admin"""
 
@@ -280,9 +284,13 @@ class Meta:
 
         redirect_link = LinkFormField(
             label=_("Link"),
-            required=True,
         )
 
+        def __init__(self, *args, **kwargs):
+            super().__init__(*args, **kwargs)
+            if args:
+                self.fields["redirect_link"].required = get_hash(RedirectAction) in args[0].get("form_actions", [])
+
         def execute(self, form, request):
             form.Meta.options["redirect"] = get_link(
                 self.get_parameter(form, "redirect_link")