fix: fix STORYBLOK_PUBLIC_TOKEN undefined (#481)

Author: annarhughes

src/utils/constants.ts

@@ -118,7 +118,8 @@ export const crispWebsiteId = getEnv(process.env.CRISP_WEBSITE_ID, 'CRISP_WEBSIT
 
 export const slackWebhookUrl = getEnv(process.env.SLACK_WEBHOOK_URL, 'SLACK_WEBHOOK_URL');
 
-export const storyblokToken = getEnv(process.env.STORYBLOK_PUBLIC_TOKEN, 'STORYBLOK_PUBLIC_TOKEN');
+export const storyblokToken =
+  getEnv(process.env.STORYBLOK_PUBLIC_TOKEN, 'STORYBLOK_PUBLIC_TOKEN') || '';
 
 export const storyblokWebhookSecret = getEnv(
   process.env.STORYBLOK_WEBHOOK_SECRET,