[CSS, NPE] Self-signed sandbox application blocked dialog does not display for JavaFX applet

Please see the comment section for details and steps to reproduce the issue



Original report:
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Component: javafx
Build: javafx8b119 32bit
PlatForm: win8-x64

for example: (test case is from deployment2/new_framework/tests/javafx/manual/FXSandBoxNewPro/testcases/FXSandBoxNewProScenarios/testCertSignedJNLP_HIGH.html)

Steps:
Test Procedure:

1. Open JCP->Security, set security level to HIGH
2. Clear cache: javaws -uninstall
3. Launch fx applet which is requesting sandbox permissions in browser: http://sqeweb.us.oracle.com/deployment2/hung/bugs/rt-34832/FXSandBoxNewProhtml/testCertSignedJNLPFX.html
4. There will be a dialog with title "Application Blocked"
5. Click "OK"
6. If the app is blocked, then test passed.

When we enable tracing/logging and show console from JCP, then load the applet, it will show like attachment.