get_console_output with body 'os-getConsoleOutput' set to non-integer doe not respond with HTTPBadRequest

"ConsoleOutputController:get_console_output" in "nova/api/openstack/compute/contrib/console_output.py", does not validate if the value of 'length' supplied in the request body can be converted to an integer. As a result, a HTTP 500 error is return, instead of a HTTPBadRequest.

To test, I added a unit test in

    api/openstack/compute/contrib/test_console_output.py

    def test_get_console_output_with_non_integer_tail(self):
        body = {'os-getConsoleOutput': {'length': 'NaN'}}
        req = webob.Request.blank('/v2/fake/servers/1/action')
        req.method = "POST"
        req.body = jsonutils.dumps(body)
        req.headers["content-type"] = "application/json"
        res = req.get_response(fakes.wsgi_app())
        output = jsonutils.loads(res.body)
        self.assertEqual(res.status_int, 400)

which supplies the value "NaN", and the test fails as 500 is returned.