Fix checking parameter type

[hluk]

Workaround for a bug in flask-pydantic.

Avoids the following exception causing server to respond with HTTP 500:

Traceback (most recent call last):
File "/venv/lib64/python3.11/site-packages/flask_pydantic/core.py", line 197, in wrapper
    b = body_model(**body_params)
        ^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: resultsdb.parsers.api_v3.BrewResultParams() argument after ** must be a mapping, not str

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/venv/lib64/python3.11/site-packages/flask/app.py", line 2190, in wsgi_app
    response = self.full_dispatch_request()
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/venv/lib64/python3.11/site-packages/flask/app.py", line 1486, in full_dispatch_request
    rv = self.handle_user_exception(e)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/venv/lib64/python3.11/site-packages/flask/app.py", line 1484, in full_dispatch_request
    rv = self.dispatch_request()
        ^^^^^^^^^^^^^^^^^^^^^^^
File "/venv/lib64/python3.11/site-packages/flask/app.py", line 1469, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/venv/lib64/python3.11/site-packages/flask_pyoidc/flask_pyoidc.py", line 463, in wrapper
    return view_func(*args, **kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/venv/lib64/python3.11/site-packages/flask_pydantic/core.py", line 204, in wrapper
    raise JsonBodyParsingError()
flask_pydantic.exceptions.JsonBodyParsingError

Server will respond instead with HTTP 400 and the following JSON body:

{
    "validation_error": {
        "body_params": [{
            "loc": ["__root__"],
            "msg": "value is not a valid dict",
            "type": "type_error.dict"
        }]
    }
}

JIRA: RHELWF-10108

[mvalik]

Have you submit a bug report to flask_pydantic?

[hluk]

Have you submit a bug report to flask_pydantic?

No, I'm rather waiting for the update to support Pydantic 2 but it takes a long time so I'm afraid that flask-pydantic is unmaintained now.

Migrating to fastapi would solve other problems too, but it could be a lot of work (I did that for product-listings-manager).

[mvalik]

+1