Handle running tests on machine with no input context.

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We've written a couple of WindowLicker  unit tests which ran fine from command 
line locally. However, when we committed them into source repository the Cruise 
Control wasn't able to run them and was throwing an error:

java.lang.NullPointerException 
at 
com.objogate.wl.keyboard.KeyboardLayout.defaultKeyboardLayoutName(KeyboardLayout
.java:75) 
at 
com.objogate.wl.keyboard.KeyboardLayout.getDefaultKeyboardLayout(KeyboardLayout.
java:71) 
at com.objogate.wl.robot.RoboticAutomaton.<init>(RoboticAutomaton.java:27) 
at 
com.objogate.wl.swing.gesture.GesturePerformer.<init>(GesturePerformer.java:13) 
... our code

By looking at the source code I found that the place it fails tries to obtain 
the current country of the current InputContext. I suspect that because Cruise 
Control runs as a service it has limited ability to obtain Java InputContext 
due to security or some other reasons.
So I added a few null checks to make sure it doesn't fail:

I suspect it has to do with the fact that Cruise Control runs as a service and 
thus has limited ability to obtain Java InputContext due to security or some 
other reasons.

src\core\main\com\objogate\wl\keyboard\Keyboard.java

private static String defaultKeyboardLayoutName() {
        String country="US";
        InputContext context = InputContext.getInstance();
        if(context!=null) {
            java.util.Locale locale=context.getLocale();
            if(locale!=null)
                country=locale.getCountry();
        }
        return Platform.is(Platform.Mac) ? "Mac-" + country : country;
    }

I think it's pretty safe fix. Could somebody add this fix to main repository so 
it's not lost. I am sure others will run into it sooner or later.

Thanks.

Original issue reported on code.google.com by nat.pr...@gmail.com on 27 Aug 2012 at 2:02