Do not report failure on empty action output
When an action invocation results in an empty container
we should be emitting a normal 204 response, not go through
the error path -- as per RFC8040 section 6.3.
JIRA: NETCONF-799
Change-Id: Ie8f3d098fc65828998b088bfed5ca89e2f438828
Signed-off-by: PeterSuna <Peter.Suna@pantheon.tech>
Signed-off-by: Ivan Hrasko <ivan.hrasko@pantheon.tech>
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>
(cherry picked from commit
916a6a5cb7e3ac5148f9cf6bb1a24bf7298ea9f6)