077b5ffffc
JIRA: https://jira.spring.io/browse/INT-4344 The `FtpOutboundGateway` provides ctors without expression for remote path. In this case it is treated as a `working directory` but only for the `LS`, `NLST`, `PUT` and `MPUT` commands. * Add assertion in the `AbstractRemoteFileOutboundGateway` to discard configuration for all other commands when `expression` is `null` **Cherry-pick to 4.3.x**