Getting the script name from the FrameMirror fails

[irbull]

Getting the scriptName results in an NPE. This is because we are getting null back for the script name from V8. It's not clear if this is a bug in V8 or something that has changed and we need to adapt.

 public void testGetSourceLocation() {
        handleBreak(new BreakHandler() {

            @Override
            public void onBreak(final DebugEvent event, final ExecutionState state, final EventData eventData, final V8Object data) {
                Frame frame = state.getFrame(0);
                result = frame.getSourceLocation();
                frame.release();
            }
        });

        v8.executeScript(script, "script", 0);

        assertEquals(5, ((SourceLocation) result).getLine());
        assertEquals("script", ((SourceLocation) result).getScriptName());
        assertEquals(0, ((SourceLocation) result).getColumn());
    }