Don't error when there is empty OneOf

[pksunkara]

Boutique gives exceptions when it encounters empty OneOf groups. For example:

+ Attributes (object)
    + id: pavan
    + One of

Also release 0.1.7 version.

[honzajavorek]

you can provide the same test with using the current testsuite:

• put AST into test/formats/samples-ast as a new sample under name of your selection
• put rendered JSON into test/formats/samples-json under the same name
• add the test case to formats-test.coffee

Also please test all the situations you fixed - oneOf for JSON Schema, oneOf for JSON, etc. How current testsuite basically works (this could be in the README, shame on me :-/ ):

• you write .mson samples for your test cases
• you run scripts/generate-samples-ast.coffee from command line - it should generate AST samples for you
• you check the AST samples
• you write down expected JSON and JSON Schema samples
• you add these new test cases to the formats-test.coffee file
• you run tests

The problem is that the script is still for protagonist-experimental instead of drafter, but that can be easily fixed I guess. Feel free to ask in case you're in troubles :)

[pksunkara]

Changing the script from protagonist-experimental to drafter is failing a few tests. I didn't want to deal with it for now.

[honzajavorek]

Please, make the test part of the existing test suite. Otherwise looks good!

[pksunkara]

@honzajavorek Updated.

[honzajavorek]

🚀