Update `YamlProcessor` to allow any value to be inserted for
empty entries. This update will allow blank strings to be used
instead of `null` which better aligns with the way that
`.properties` files are loaded.

This update also allows allows the specified `emptyValue` to be
inserted instead of a blank String when the YAML contains `null`
or `~` values.

See spring-projectsgh-36197
See spring-projectsgh-19986

Signed-off-by: Phillip Webb <phil.webb@broadcom.com>

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