Regression :Invalid import options throw Java Web Start Error from 6u22 b05

1) Specifying an incorrect location for a jnlp file in the import command
  javaws -import C:\test.jnlp ( test.jnlp should not be present in C:)

2) Specifying an incorrect extension in place of jnlp
   javaws -import C:\test.xyz

Expected behavior:
The application should not be launched and should give a proper error dilaog.

Actual Behavior :
The application is not launched and shows the error dialog.On clicking OK on the error dialog Java Webstart Error dialog is shown.

This behavior is seen from 6u22 b05.(b04 is working fine)
3) Specifying multiple jnlps with import also shows the same error
 javaws -import a.jnlp b.jnlp