Validation Mismatch (any non-nullable message)

Consider the following:

```python
@parameter(key="message", type="Any", nullable=False)
def echo_message(self, message):
  return message
```

If you make a request with parameters **`{"message": null}`** the API will throw a validation error. However the GUI does not catch this as a null value is not valid. This has to do with the raw-directive.