As in this case (without using `Annotated`) we have to replace the default value `None` in the function with `Query()`, we now need to set the default value with the parameter `Query(default=None)`, it serves the same purpose of defining that default value (at least for FastAPI).

So:

```Python
q: Union[str, None] = Query(default=None)
```

...makes the parameter optional, with a default value of `None`, the same as:

```Python

# o isSuppressSchemaHtmlProcedure: (NotRequired - Default false)
# o historyHtmlFileName: (NotRequired - Default 'history-[project-name].html')
# o isCheckColumnDefOrderDiff: (NotRequired - Default false)
# o isCheckDbCommentDiff: (NotRequired - Default false)
# o isCheckProcedureDiff: (NotRequired - Default false)
# o loadDataReverseMap: (NotRequired - Default map:{})
# o schemaSyncCheckMap: (NotRequired - Default map:{})

        '"dom_id": "#swagger-ui"' in response.text
    ), "default configs should be preserved"
    assert "presets: [" in response.text, "default configs should be preserved"
    assert (
        "SwaggerUIBundle.presets.apis," in response.text
    ), "default configs should be preserved"
    assert (
        "SwaggerUIBundle.SwaggerUIStandalonePreset" in response.text
    ), "default configs should be preserved"
    assert (

                  "services": [
                    {
                      "host": "productpage.default.svc.cluster.local",
                      "namespace": "default",
                      "name": "productpage"
                    }
                  ],
                  "config": "/apis/networking.istio.io/v1alpha3/namespaces/default/destination-rule/productpage",
                  "subset": "v1"
                }
              }

    @Nonnull
    default MessageBuilder warning(Object message) {
        return style("." + Constants.MAVEN_STYLE_WARNING_NAME + ":-" + Constants.MAVEN_STYLE_WARNING_DEFAULT, message);
    }

    /**
     * Append message content in error style.
     * By default, bold red
     *
     * @param message the message to append
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder error(Object message) {

);o.default(l).one(d.TRANSITION_END,(function(){o.default(u).removeClass(n+" "+i).addClass(S),o.default(l).removeClass("active "+i+" "+n),s._isSliding=!1,setTimeout((function(){return o.default(s._element).trigger(h)}),0)})).emulateTransitionEnd(g)}else o.default(l).removeClass(S),o.default(u).addClass(S),this._isSliding=!1,o.default(this._element).trigger(h);c&&this.cycle()}},t._jQueryInterface=function(e){return this.each((function(){var n=o.default(this).data(w),i=r({},k,o.default(this).data());"object"==typeof...

                        "istio": {
                          "config": "/apis/networking.istio.io/v1alpha3/namespaces/default/virtual-service/bookinfo"
                        }
                      }
                    },
                    "decorator": {
                      "operation": "productpage.default.svc.cluster.local:9080/productpage"
                    }
                  },
                  {

			ns:   nsTestObject("test1", "", ""),
			expectedMessages: []webhookAnalysis{
				{
					Name:     "istio-sidecar-injector",
					Revision: "default",
					Reason: "No matching namespace labels (istio.io/rev=default, istio-injection=enabled) " +
						"or pod labels (istio.io/rev=default, sidecar.istio.io/inject=true)",
				},
				{
					Name:     "istio-sidecar-injector-1-16",
					Revision: "1-16",

10.244.0.192:9080                                HEALTHY                  outbound|9080||reviews.default.svc.cluster.local
10.244.0.193:9080                                HEALTHY                  outbound|9080||reviews.default.svc.cluster.local
10.244.0.195:9080                                HEALTHY                  outbound|9080||reviews.default.svc.cluster.local

workloads:
- uid: cluster1//v1/Pod/default/local
  name: local
  namespace: default
  serviceAccount: default
  workloadIps: ["127.0.0.1"]
  protocol: HBONE
  node: local
  network: ""
  services:
    "default/example.com":
      80: 8080
    "default/example2.com":
      80: 8080