JENKINS-30515 Adding messages for credentials use: empty, found and not found

Author: joseblas

src/test/java/hudson/plugins/git/CredentialsUserRemoteConfigTest.java

@@ -25,6 +25,7 @@ public class CredentialsUserRemoteConfigTest {
 
     @Rule
     public JenkinsRule r = new JenkinsRule();
+
     @Rule
     public GitSampleRepoRule sampleRepo = new GitSampleRepoRule();