[BC Break][3.4.x] cannotBeEmpty is not applicable to concrete nodes #24614
Description
| Q | A |
|---|---|
| Bug report? | no |
| Feature request? | no |
| BC Break report? | yes |
| RFC? | no |
| Symfony version | 3.4.x |
This seems to be caused by d40e7e4.
[RuntimeException]
In ArrayNodeDefinition.php line 501:
->requiresAtLeastOneElement() is not applicable to concrete nodes
at path "forward.handlers"
My guess is that this should be a deprecation rather than an exception for 3.4.