invalid logging mod-email 1.9.1

mod-email-1.9.1 does not log messages, reports problem with logging implementation.

To Reproduce:

git clone git@github.com:folio-org/mod-email.git && cd mod-email
git checkout v1.9.1
mvn clean install
java -jar target/mod-email-fat.jar

Still able to send emails normally when 1.9.1 is deployed, but log messages do not show up. Attached full log from mod-email-1.9.1.

(This was fixed in master, but nobody bothered to put it in to the release branch b1.9).