loadkeys

The bug can be reproduced this way:

> loadkeys US
ERROR [KeyboardInterpreterFactory]: Keyboard interpreter for US not found.
Not found
Done.
> loadkeys DK
Done.
> loadkeys
Exception in command
java.lang.NullPointerException: NPE at address 001E25AF
at java.lang.String.toUpperCase(String.java:2682)
at org.jnode.driver.input.KeyboardInterpreterFactory.getKeyboardInterpreter(KeyboardInterpreterFactory.java:114)
at org.jnode.shell.command.LoadkeysCommand.execute(LoadkeysCommand.java:104)

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