Permission denied => default chart

[Soren]

Hi,

Had the pleasure of trying to debug why a chart came up very
incorrectly - it was the default column chart instead of the specified
chart.

Turns out that I had forgotten that I have a
before_filter :login_required in the controller, and the load_chart
code therefore failed.

It would be nice to have the chart produce an error message about this
rather than loading the wrong chart.

/S