Update lib/cldr.js

Author: papandreou

lib/cldr.js

@@ -850,11 +850,11 @@ Cldr.prototype = {
     );
     const dayPeriodRules = xpath.select('dayPeriodRule', dayPeriodRulesNode);
 
-    const dayPeriodRulesSelectNode = xpath.select(
+    const dayPeriodRulesSelectNode = xpath.select1(
       "/supplementalData/dayPeriodRuleSet[@type='selection']" +
         `/dayPeriodRules[@locales='${localeId}']`,
       document,
-    )[0];
+    );
     const dayPeriodSelectsRules = xpath.select(
       'dayPeriodRule',
       dayPeriodRulesSelectNode,