Date Range Picker Bug

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Hi,

I've discovered a bug in the dashboard designer. When you put a date range picker on the dashboard and clear either 'from' or 'to' properties, the whole dashboard is not shown when attempting to render it.

To replicate, add a date range picker to a dashboard, clear the 'from' and 'to' properties and toggle 'Edit markup' twice.

Thanks for looking into it :)

@silvia thanks fixed for next release. I think we will also have to try and compile each element individually and catch the errors in the future so this sort of scenario doesn't repeat itself.