Only use #original_message in Api::BaseController#parameter_missing_error if defined #3940
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While working on solidusio-contrib/solidus_related_products#88 for solidus_related_products, I came across a bug that has caused every branch on that repository to fail its specs.
Sometimes, for reasons that I don't completely understand, the
ParameterMissing
error class does not define#original_message
, causing aNoMethodError
to be raised, which obscures the original execption and returns a 500 status response.Further background is detailed in #3941
As error handling should not raise its own obscuring error, use the #try method to obtain #original_message, if defined.
Checklist: