Incorrect information is given when jar file is missing

When use DT to deploy the javafx applet, and the jar file is missing, there will be a information: "JavaFX application could not launch due to system configuration. See java.com/javafx for troubleshooting".
This information is incorrect and will cover the true reason why it failed.

Steps to reproduce.
1. Install JRE7 from http://jre.us.oracle.com/java/re/jdk/1.7.0_06/promoted/all/b16/bundles/windows-i586/
2. Launch the Javafx applet from: http://sqeweb.us.oracle.com/deployment2/sheldon/webCases/FXDTManualTest/html/applet-dynamic1.html
3. If the applet failed to get launched and has information: "JavaFX application could not launch due to system configuration. See java.com/javafx for troubleshooting", the bug is reproducible

This is the test case, which has the fish.jar.
http://sqeweb.us.oracle.com/deployment2/sheldon/webCases/FXDTManualTest/html1/applet-dynamic1.html