[1143918] Addition of new Log Event Source using JBoss ON CLI will break the UI if all properties (even unset ones) are not added
Add support for the missing properties in this use case.

(cherry picked from commit 008dba2cfc66770d4422d2a23ede2327ad93d78c)
Signed-off-by: Jay Shaughnessy <jshaughn@redhat.com>