Subresource on same line generates invalid default constructor.

[ullgren]

Describe the bug
When a resource with a sub-resource is defined on the same line the default constructor of the parent resource class does not properly initialize the sub-resource.

To Reproduce
Steps to reproduce the behavior:

1. Create a RAML that contains the following resource definition.

/projects/rename:
      put:
        description: Rename a project
        body:
          #schema: projectName
        responses:
          202:
          404:

2. Generate client code
3. Try to compile the generated source
4. There is a error The blank final field rename may not have been initialized on the default constructor for the projects resource class (resource/projects/Projects.java).

Expected behavior
The subresource attribute should be initialized to null in the default constructor as is the case when defining the subresource on a second line.