NPE when QueryParameter is of type Array and has no CollectionFormat.

For an array QueryParameter described like (Note there is no collectionFormat):

      parameters:
        - in: query
          name: color
          type: array
          items:
            type: string

The Swagger Request Validator throws a NPE when trying to validate the parameters of the query.

This happens at ArrayParameterValidator.java class on doValidate method, on:

return doValidate(CollectionFormat.from(parameter).split(value), parameter);

because CollectionFormat.from(parameter) assumes that the parameter has a CollectionFormat.

Instead of throwing the NPE, it could log an error saying that a CollectionFormat is required in the parameter definition at the Swagger spec.

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