Return error:true instead of success:false for errors on routes
Return error:true instead of success:false for errors on routes

Since we're not returning a success or error parameter with a 200 response,
it makes more sense to return error:true on an error response.  This way you
can check `if (res.body.error)`, whereas `if (res.body.success)` would have
returned falsy either way.

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