Allow 'before_error_render' hook to modify token values passed to the rendering engine. #1218
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The 'before_error_render' hook is now called with two arguments. The
second argument is a hashref holding the tokens that will be passed to the
template rendering engine. This gives that hook an opportunity to modify
the token values, and even more importantly to add any extra tokens
necessary for the proper rendering of the error template.
This change gives 'before_error_render' the same functionality that is
already provided to 'before_template_render', putting it on an equal
footing.