Splunk HEC does not accept log events with an empty string or a
whitespace-only string.
Signed-off-by: Florian Noeding <florian@noeding.com>
(cherry picked from commit 5f6d6a5093a4db799f9c1a6bb82eed1eea13ec0c)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>