Description of problem:
 Password for truststore could be empty once user enter some values for keystore.

Version-Release number of selected component (if applicable):
 EAP 6.2.0.ER7

How reproducible:
 Always

Steps to Reproduce:
 1. Run GUI installer, go to post-install configuration using default values.
 2. Select to "Add a new security-domain".
 3. Press Next on "Security-Domain configuration" screen to get onto JSSE configuration screen.
 4. Select to add both keystore and truststore elements.
 5. Enter some values into "Keystore password", "Confirm keystore password", "Keystore URL", "Truststore URL", and press Next (leave fields for truststore password empty).

Actual results:
 No error message. Post-install configuration task will fail.

Expected results:
 Error dialog with "Truststore requires the password and URL fields to be set." message is shown (same as if we remove keystore element).