Minor tweak

src/utils/index.js

@@ -78,6 +78,7 @@ export const addPolyfills = () => {
  * Helper to init the i18n class with a pre-defined or auto-detected locale.
  */
 export const setLocale = locale => {
+  if (locale) {
     try {
       const l = locale === 'auto' ?
         window.navigator.userLanguage || window.navigator.language : locale;
@@ -87,3 +88,4 @@ export const setLocale = locale => {
       console.warn(`Unsupported locale '${locale}'. Falling back to default en.`);
     }
   }
+}