Bug 1617455 - Use empty array for empty locale string. r=zbraniecki

Differential Revision: https://phabricator.services.mozilla.com/D65223

--HG--
extra : moz-landing-system : lando

browser/components/enterprisepolicies/Policies.jsm

@@ -1210,8 +1210,10 @@ var Policies = {
     onBeforeAddons(manager, param) {
       if (Array.isArray(param)) {
         Services.locale.requestedLocales = param;
-      } else {
+      } else if (param) {
         Services.locale.requestedLocales = param.split(",");
+      } else {
+        Services.locale.requestedLocales = [];
       }
     },
   },

browser/components/enterprisepolicies/tests/xpcshell/test_requestedlocales.js

@@ -45,3 +45,24 @@ add_task(async function test_requested_locale_string() {
   await localePromise;
   Services.locale.requestedLocales = originalLocales;
 });
+
+add_task(async function test_system_locale_string() {
+  let originalLocales = Services.locale.requestedLocales;
+
+  let localePromise = promiseLocaleChanged("und");
+  Services.locale.requestedLocales = ["und"];
+  await localePromise;
+
+  let systemLocale = Cc["@mozilla.org/intl/ospreferences;1"].getService(
+    Ci.mozIOSPreferences
+  ).systemLocale;
+  localePromise = promiseLocaleChanged(systemLocale);
+
+  await setupPolicyEngineWithJson({
+    policies: {
+      RequestedLocales: "",
+    },
+  });
+  await localePromise;
+  Services.locale.requestedLocales = originalLocales;
+});