fix: format undefined fields

bin/index.js

@@ -42,7 +42,7 @@ async function run() {
   // scheduled running
   if (interval === 0) return;
   logger.debug(`Starting interval (${interval}s)...`);
-  runInterval(() => fetchAndIndex().catch(handleError), interval * 1000);
+  runInterval(fetchAndIndex, interval * 1000);
 }
 
 run().catch(handleError);

src/lib/get-data.mjs

@@ -2,7 +2,6 @@ import fetch from './fetch.mjs';
 
 const formatNumber = str => str && Number(`${str}`.replace(/[^0-9.-]/, ''));
 const formatString = str => {
-  if (str == null) return 'N/A';
   if (typeof str !== 'string') return str;
   return str && str.length && str !== 'undefined' ? str.trim() : 'N/A';
 };