Fix 'NaNK' in shortNumberFormat

app/soapbox/utils/numbers.js

@@ -1,7 +1,11 @@
 import React from 'react';
 import { FormattedNumber } from 'react-intl';
 
+const isNumber = number => typeof number === 'number' && number !== NaN;
+
 export const shortNumberFormat = number => {
+  if (!isNumber(number)) return '•';
+
   if (number < 1000) {
     return <FormattedNumber value={number} />;
   } else {