8011686: AWT accidentally disables the NSApplicationDelegate of SWT, causing...

8011686: AWT accidentally disables the NSApplicationDelegate of SWT, causing loss of OS X integration functionality
Reviewed-by: anthony, serb
Contributed-by: NMarkus Persson <markus.persson@oracle.com>

src/macosx/native/sun/awt/awt.m

@@ -316,7 +316,10 @@ AWT_ASSERT_APPKIT_THREAD;
     // its finishLaunching has initialized it.
     //  ApplicationDelegate is the support code for com.apple.eawt.
     [ThreadUtilities performOnMainThreadWaiting:YES block:^(){
-        OSXAPP_SetApplicationDelegate([ApplicationDelegate sharedDelegate]);
+        id<NSApplicationDelegate> delegate = [ApplicationDelegate sharedDelegate];
+        if (delegate != nil) {
+            OSXAPP_SetApplicationDelegate(delegate);
+        }        
     }];
 }