README update

Author: bstewartlg

README.md

@@ -2,7 +2,7 @@
 This subproject provides a small web application that is capable of generating CRD requests and displaying the CDS Hooks cards that are provided as a response. This project is written in JavaScript and runs in [node.js](https://nodejs.org/en/).  
 
 ## Running the request generator standalone
-1. Install node.js
+1. Install [Node.js 16](https://nodejs.org) (Node 18+ not currently supported)
 2. Clone the repository
   * `git clone https://github.com/HL7-DaVinci/crd-request-generator.git`
 3. Install the dependencies

src/util/buildRequest.js

@@ -37,7 +37,7 @@ export default function buildRequest(request, patient, ehrUrl, token, prefetch,
         "fhirServer": ehrUrl,
         "hook": hook,
         "fhirAuthorization": {
-            "access_token": token.access_token,
+            "access_token": token?.access_token,
             "token_type": "Bearer",
             "expires_in": 300,
             "scope": "patient/Patient.read patient/Observation.read",