Fatal error when resource cannot be resolved

[Werner Lehmann]

Hi,

recently I have localized my FX code. I noticed that the FXMLLoader 
would throw an exception if it cannot resolve a resource key. As a 
consequence, the FXML is not loaded and the JFXPanel does not show in 
the GUI. More NPE can be expected because the object graph is now null.

This seems a bit drastic. Maybe it is better to show the unresolved key 
instead in the GUI? With some logging in place I would probably just log 
this as a warning.

Werner