(js) Handle corrupted JSON data in Mail module

UI/WebServerResources/js/Mailer/Account.service.js

@@ -154,6 +154,7 @@
             catch (e) {
               Account.$log.warn("Can't parse list of expanded folders. String was: " +
                                 Account.$Preferences.settings.Mail.ExpandedFolders);
+              expandedFolders = [];
             }
           }
           else {