[rfc][icedtea-web] possible class cast exception in splashcontroler

[Jiri Vanek]

Some applets, may not be using the original apllet-viewer-pane, but rather *detach*, and are in 
separate window.

If such an applet fails, the error screen can not be drawn, because the applications frame is not 
SpalshController.

As splash logic can live happily with null splashcontoloere (==not work, and silently exit) , the 
class cast exception is unnecessary.

There is nothing to be done to save the application as it already died, but the error is imho really 
unnecessary.

J

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