fix: redirect on calendar oauth denied auth (#18228)

apps/api/v2/src/ee/calendars/services/gcal.service.ts

@@ -116,7 +116,7 @@ export class GoogleCalendarService implements OAuthCalendarApp {
   ) {
     // User chose not to authorize your app or didn't authorize your app
     // redirect directly without oauth code
-    if (!code) {
+    if (!code || code === "undefined") {
       return { url: redir || origin };
     }
 

apps/api/v2/src/ee/calendars/services/outlook.service.ts

@@ -151,7 +151,7 @@ export class OutlookService implements OAuthCalendarApp {
     redir?: string
   ) {
     // if code is not defined, user denied to authorize office 365 app, just redirect straight away
-    if (!code) {
+    if (!code || code === "undefined") {
       return { url: redir || origin };
     }