* INT-3333: Return empty list as is from DB gateway
Fixes https://jira.spring.io/browse/INT-3333
In `JdbcOutboundGateway` and `JpaOutboundGateway` the empty result list
is treated as "no reply" and therefore `null` is returned cause
the flow to stop at this point.
It is better to return such a result as is and the target application to
decided what to do with it, e.g. a `discardChannel` on a downstream splitter
configuration.
NOTE: the `MongoDbOutboundGateway` doesn't treat an empty result as a `null`
* * Fix language in docs
Co-authored-by: Gary Russell <grussell@vmware.com>
Co-authored-by: Gary Russell <grussell@vmware.com>
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