BUG: malformed includes raises NoMethodError

This issue is a (choose one):

• Problem/bug report.
• Feature request.
• Request for support. Note: Please try to avoid submitting issues for support requests. Use Gitter instead.

Checklist before submitting:

• I've searched for an existing issue.
• I've asked my question on Gitter and have not received a satisfactory answer.
• I've included a complete bug report template. This step helps us and allows us to see the bug without trying to reproduce the problem from your description. It helps you because you will frequently detect if it's a problem specific to your project.
• The feature I'm asking for is compliant with the JSON:API spec.

Description

Choose one section below and delete the other:

Bug reports:

The CSV gem raises a NoMethodError when passed an array

e.g. CSV.parse_line(["memberships"]) raises

private method `gets' called for ["memberships"]:Array

And JR in 0.9.x and 0.10.x in a few places uses CSV.parse_line but only rescues CSV::MalformedCSVError

making a request like v1/users/:id?include[]=memberships with call e.g. JSONAPI::RequestParser#parse_include_directives with ["memberships"] and raise an unhandled error.

My proposal is 1) encapsulate wherever CSV.parse_line is called and 2) ensure any errors are handled and raises as JSONAPI::Exceptions

I could possibly make PRs to 0.9 and 0.10

(We're still on 0.9 due to bugs changes in handling of polymorphic types and plain old resources, but I'd like to help however I can)

Comienza en JSONAPI::RequestParser#parse_include_directives y sigue los lugares donde se llama a CSV.parse_line en las rutas de código 0.9 y 0.10. Reproduce la entrada de tipo array de include[]=memberships y, después, verifica que una entrada con formato incorrecto ya no provoque un NoMethodError no controlado y se exponga como un error de JSONAPI::Exceptions.