Fix bug: env var csv split was wrongly applied

Addresses review comments
#162 (comment)
and
#162 (comment)

Author: feuGeneA

src/config.ts

@@ -100,9 +100,11 @@ export const LIQUIDITY_POOL_REGISTRY_ADDRESS: string | undefined = _.isEmpty(
           EnvVarType.ETHAddressHex,
       );
 
-export const RFQT_API_KEY_WHITELIST: string[] = (process.env.RFQT_API_KEY_WHITELIST || '[]').split(',');
+export const RFQT_API_KEY_WHITELIST: string[] =
+    process.env.RFQT_API_KEY_WHITELIST === undefined ? [] : process.env.RFQT_API_KEY_WHITELIST.split(',');
 
-export const RFQT_MAKER_ENDPOINTS: string[] = (process.env.RFQT_MAKER_ENDPOINTS || '[]').split(',');
+export const RFQT_MAKER_ENDPOINTS: string[] =
+    process.env.RFQT_MAKER_ENDPOINTS === undefined ? [] : process.env.RFQT_MAKER_ENDPOINTS.split(',');
 
 // Max number of entities per page
 export const MAX_PER_PAGE = 1000;