NPE caused by JDK-6990109 fix

need to check for null in JavaFXAppDesc.getArguments() and ApplicationDesc.getArguments:

    public String[] getArguments() {
        return (arguments == null) ? null :
               Arrays.copyOf(arguments, arguments.length);
    }

can be seen with:
http://stt-13.ru.oracle.com:8080/JavawsMustangIntegTest/7uX_tests/FXOcspAndCrlCheck/html/testOCSPAndCRLRevokedCert.html