fixes #1034 - allow spec to have empty server array

Author: mrin9

src/templates/endpoint-template.js

@@ -140,7 +140,7 @@ function endpointBodyTemplate(path) {
           .request_body = "${path.requestBody}"
           .api_keys = "${nonEmptyApiKeys}"
           .servers = "${path.servers}" 
-          server-url = "${path.servers && path.servers.length > 0 ? path.servers[0].url : this.selectedServer.computedUrl}" 
+          server-url = "${path.servers && path.servers.length > 0 ? path.servers[0].url : this.selectedServer?.computedUrl}" 
           active-schema-tab = "${this.defaultSchemaTab}"
           fill-request-fields-with-example = "${this.fillRequestFieldsWithExample}"
           allow-try = "${this.allowTry}"

src/templates/expanded-endpoint-template.js

@@ -128,7 +128,7 @@ export function expandedEndpointBodyTemplate(path, tagName = '', tagDescription
           .request_body = "${path.requestBody}"
           .api_keys = "${nonEmptyApiKeys}"
           .servers = "${path.servers}"
-          server-url = "${path.servers?.[0]?.url || this.selectedServer.computedUrl}"
+          server-url = "${path.servers?.[0]?.url || this.selectedServer?.computedUrl}"
           fill-request-fields-with-example = "${this.fillRequestFieldsWithExample}"
           allow-try = "${this.allowTry}"
           show-curl-before-try = "${this.showCurlBeforeTry}"

src/templates/security-scheme-template.js

@@ -261,7 +261,7 @@ function oAuthFlowTemplate(flowName, clientId, clientSecret, securitySchemeId, a
   const pkceOnly = authFlow['x-pkce-only'] || false;
   const isUrlAbsolute = (url) => (url.indexOf('://') > 0 || url.indexOf('//') === 0);
   // Calculcate base URL
-  const url = new URL(this.selectedServer.computedUrl);
+  const url = new URL(this.selectedServer?.computedUrl);
   const baseUrl = url.origin;
 
   if (refreshUrl && !isUrlAbsolute(refreshUrl)) {