[rfc][icedtea-web]: Hide unsupported security options in itw-settings

[Andrew Su]

Hello,

This is a simple patch for hiding the values. getProperty() in DeploymentConfigurations.java was changed such that null is returned instead of a NullPointerException being thrown in the case that the value is not set. This patch  adds a check to see if the value is null and proceed to next item.

Comments?

--Andrew
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