Using Jenkins.getInstanceOrNull.

core/src/main/java/hudson/console/ConsoleNote.java

@@ -192,7 +192,7 @@ public abstract class ConsoleNote<T> implements Serializable, Describable<Consol
         DataOutputStream dos = new DataOutputStream(new Base64OutputStream(buf2,true,-1,null));
         try {
             buf2.write(PREAMBLE);
-            if (Jenkins.getInstance() != null) { // else we are in another JVM and cannot sign; TODO 1.653+ use getInstanceOrNull
+            if (Jenkins.getInstanceOrNull() != null) { // else we are in another JVM and cannot sign; result will be ignored unless INSECURE
                 byte[] mac = MAC.mac(buf.toByteArray());
                 dos.writeInt(- mac.length); // negative to differentiate from older form
                 dos.write(mac);