filter empty records

enzevalos_iphone/Folder+CoreDataClass.swift

@@ -57,7 +57,7 @@ public class Folder: NSManagedObject {
             guard keyRecords != nil && keyRecords?.count ?? 0 > 0 else {
                 return []
             }
-            let rs = DataHandler.handler.getAllKeyRecords()
+            let rs = DataHandler.handler.getAllKeyRecords().filter{$0.mails.count > 0}
             return rs
         }
     }