fix: improve test coverage of Documentation component

Author: shanejonas

src/Documentation.test.tsx

@@ -7,3 +7,9 @@ it("renders without crashing", () => {
   ReactDOM.render(<Documentation schema={{} as any}/>, div);
   ReactDOM.unmountComponentAtNode(div);
 });
+
+it("renders without crashing with no schema", () => {
+  const div = document.createElement("div");
+  ReactDOM.render(<Documentation />, div);
+  ReactDOM.unmountComponentAtNode(div);
+});

src/Documentation.tsx

@@ -6,7 +6,7 @@ import ContentDescriptors from "./ContentDescriptors/ContentDescriptors";
 import { OpenrpcDocument } from "@open-rpc/meta-schema";
 
 interface IProps {
-  schema: OpenrpcDocument;
+  schema?: OpenrpcDocument;
   uiSchema?: any;
   reactJsonOptions?: any;
   methodPlugins?: Array<React.FC<IMethodPluginProps>>;