[9] Review request for 8132706 [macosx] Toolkit.getImage() throws NPE for null URL

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8132706
  webrev: http://cr.openjdk.java.net/~alexsch/8132706/webrev.00

  The fix makes the Toolkit.getDefaultToolkit().getImage(URL) return a 
ToolkitImage based on URLImageSource with null url as it was before the 
fix JDK-8011059.

  Thanks,
  Alexandr.