return empty string when no changes are detected (#2984)

diff --git a/scripts/jenkins/Jenkinsfile b/scripts/jenkins/Jenkinsfile
index 3fd4e554629f2888c8d4c038576b50d387f4d56c..8b8ac39b0a77ad9a8a7ca746db6e0bca448d842d 100644 (file)
--- a/scripts/jenkins/Jenkinsfile
+++ b/scripts/jenkins/Jenkinsfile
@@ -26,6 +26,7 @@ def detectChanges() {
             }
         }
     }
+    return string
 }
 
 /*