Error Message not displayed when wrong jnlp location typed in JavaWebStart "Application Manager".

Currently error message is displayed when wrong jnlp file location is given as argument in command line to launch an application.

javaws http://java.sun.com/products/javawebstart/app_not_available/notavailable.jnlp

Error message : "Unable to launch the specified application"

same message should be displayed when incorrect url is mentioned in JavaWebStart Application Manager"

Workaround: If the console is enabled before launching the JavaWebStart the exception message will be displayed in console,but it depends on the user if the user is non technical person he will not be able to get the message displayed in console.

Steps to reproduce:
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1) launch JavaWebstart version 1.5.0
2) Click View Menu and select "Downloaded Application" Menu item
3) In Location combo box enter any invalid jnlp url location
4) Click Enter

No Error Message displayed and the status of the process is unknown.

Tested configuration:
O.S : win2K
JDK : build 1.5.0-beta-b07

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