[FIX JENKINS-43218] Fix Fingerprint.toString() (#3910)

* [FIX JENKINS-43218] Fix Fingerprint.toString()

1. Fix Fingerprint.toString() method when
   variable usages = null .

Signed-off-by: Mit Naria <mit4dev@gmail.com>

* [FIX JENKINS-43218] Fix Fingerprint.toString()

1. Fix Fingerprint.toString() method when
   variable usages = null .

* [JENKINS-43218] - Retrigger the build after the Java 11 fixes on ci.jenkins.io

(cherry picked from commit 399c8ba4)