Remove non null assertion from env

Author: francisco-videira-nhs

lambdas/api-handler/src/config/env.ts

@@ -7,11 +7,11 @@ export interface LambdaEnv {
 }
 
 export const lambdaEnv: LambdaEnv = {
-  SUPPLIER_ID_HEADER: getEnv('SUPPLIER_ID_HEADER')!,
-  APIM_CORRELATION_HEADER: getEnv('APIM_CORRELATION_HEADER')!,
-  LETTERS_TABLE_NAME: getEnv('LETTERS_TABLE_NAME')!,
-  LETTER_TTL_HOURS: getEnv('LETTER_TTL_HOURS')!,
-  DOWNLOAD_URL_TTL_SECONDS: getEnv('DOWNLOAD_URL_TTL_SECONDS')!
+  SUPPLIER_ID_HEADER: getEnv('SUPPLIER_ID_HEADER'),
+  APIM_CORRELATION_HEADER: getEnv('APIM_CORRELATION_HEADER'),
+  LETTERS_TABLE_NAME: getEnv('LETTERS_TABLE_NAME'),
+  LETTER_TTL_HOURS: getEnv('LETTER_TTL_HOURS'),
+  DOWNLOAD_URL_TTL_SECONDS: getEnv('DOWNLOAD_URL_TTL_SECONDS')
 };
 
 function getEnv(name: string): string {