JBR-9527: Fix NPE with WLDataDevice.performDeletionsOnEDT() when headless [WLToolkit]

Author: tsarn

src/java.desktop/unix/classes/sun/awt/wl/WLToolkit.java

@@ -276,7 +276,9 @@ public void run() {
                     WLToolkit.awtLock();
                     try {
                         dispatchEventsOnEDT();
-                        dataDevice.performDeletionsOnEDT();
+                        if (dataDevice != null) {
+                            dataDevice.performDeletionsOnEDT();
+                        }
                     } finally {
                         eventsQueued.release();
                         WLToolkit.awtUnlock();