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Question: multiple @response decorators

See original GitHub issue

Hello, i have defined two response types on my view function:

    @blp.response(code=404, description="Product not found")
    @blp.response(ProductSchema(), code=200)
    def get(self, product_id):
        ...

Generated documentations contains description of those two possible response types and looks perfect.

If view is aborted via abort(404) then everything works as expected, but i got an error otherwise:

2018-11-22 18:18:43.686 INFO    127.0.0.1 - - [22/Nov/2018 18:18:43] "GET /api/products/1/ HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/views.py", line 88, in view
    return self.dispatch_request(*args, **kwargs)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/views.py", line 158, in dispatch_request
    return meth(*args, **kwargs)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask_rest_api/response.py", line 55, in wrapper
    resp = jsonify(self._prepare_response_content(result_dump))
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/json/__init__.py", line 321, in jsonify
    dumps(data, indent=indent, separators=separators) + '\n',
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/json/__init__.py", line 179, in dumps
    rv = _json.dumps(obj, **kwargs)
  File "/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/__init__.py", line 238, in dumps
    **kw).encode(obj)
  File "/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/encoder.py", line 201, in encode
    chunks = list(chunks)
  File "/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/encoder.py", line 437, in _iterencode
    o = _default(o)
  File "/Users/asyncee/app/env/lib/python3.6/site-packages/flask/json/__init__.py", line 81, in default
    return _json.JSONEncoder.default(self, o)
  File "/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__)
TypeError: Object of type 'Response' is not JSON serializable

So my question is: am i doing everything correctly and multiple decorators supported?