8051359: JPopupMenu creation in headless mode with JDK9b23 causes NPE

Reviewed-by: serb, pchelko

src/share/classes/sun/awt/SunToolkit.java

@@ -386,7 +386,7 @@ public abstract class SunToolkit extends Toolkit
      * null or the target can't be found, a null with be returned.
      */
     public static AppContext targetToAppContext(Object target) {
-        if (target == null || GraphicsEnvironment.isHeadless()) {
+        if (target == null) {
             return null;
         }
         AppContext context = getAppContext(target);
@@ -460,12 +460,10 @@ public abstract class SunToolkit extends Toolkit
      * via targetToAppContext() above.
      */
     public static void insertTargetMapping(Object target, AppContext appContext) {
-        if (!GraphicsEnvironment.isHeadless()) {
-            if (!setAppContext(target, appContext)) {
-                // Target is not a Component/MenuComponent, use the private Map
-                // instead.
-                appContextMap.put(target, appContext);
-            }
+        if (!setAppContext(target, appContext)) {
+            // Target is not a Component/MenuComponent, use the private Map
+            // instead.
+            appContextMap.put(target, appContext);
         }
     }