[PYTHON] Bug: allOf tag not supported in inline schema

Description

While working on a project, I discovered that I was unable to put 'allOf':[] schema defs in an inline definition. (by that I mean that I defined the schema inside the operation object).

For this particular project it is not desirable to put these definitions under the global definitions object, because it would lead to a very large definitions object that would be difficult to maintain.

Swagger-codegen version

Latest master as of June 25, 2016

Swagger declaration file

Here is a swagger file with an allOf definition in the definitions object. It generates successfully.
swagger.json

Here is a near identical script, but with the allOf definition in the inline schema. It does not validate successfully.
swaggerFail.json

Command line used for generation

Command line args & error message:

java -jar ~/workspace/git/vco/tools/api/swagger-codegen-cli.jar generate -i ~/git_issues/swaggerFail.json -l python -o ~/git_issues/python

[main] INFO io.swagger.parser.Swagger20Parser - reading from /home/vc/git_issues/swaggerFail.json
[main] INFO io.swagger.codegen.AbstractGenerator - writing file /home/vc/git_issues/python/swagger_client/models/sub_model.py
[main] INFO io.swagger.codegen.DefaultGenerator - File exists. Skipped overwriting /home/vc/git_issues/python/test/test_sub_model.py
[main] INFO io.swagger.codegen.AbstractGenerator - writing file /home/vc/git_issues/python/docs//SubModel.md
Exception in thread "main" java.lang.RuntimeException: Could not process operation:
  Tag: default
  Operation: no
  Resource: post /thisDoesnt
  Definitions: {sub_model=io.swagger.models.ModelImpl@80d280e4}
  Exception: null
    at io.swagger.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:785)
    at io.swagger.codegen.DefaultGenerator.processPaths(DefaultGenerator.java:680)
    at io.swagger.codegen.DefaultGenerator.generate(DefaultGenerator.java:365)
    at io.swagger.codegen.cmd.Generate.run(Generate.java:223)
    at io.swagger.codegen.SwaggerCodegen.main(SwaggerCodegen.java:36)
Caused by: java.lang.NullPointerException
    at io.swagger.codegen.DefaultCodegen.isDataTypeBinary(DefaultCodegen.java:2250)
    at io.swagger.codegen.DefaultCodegen.fromParameter(DefaultCodegen.java:2233)
    at io.swagger.codegen.DefaultCodegen.fromOperation(DefaultCodegen.java:1835)
    at io.swagger.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:733)
    ... 4 more

Steps to reproduce

Download the swaggerFail.json, and try to generate it with the command shown above.

Reproduce the failure with swaggerFail.json and the Java CLI command shown. Read DefaultGenerator.processOperation and the DefaultCodegen.fromOperation, fromParameter, and isDataTypeBinary stack frames, comparing them with the working swagger.json. Done when the inline allOf schema validates and Python generation completes without the reported exception.