修复异常

src/Hotline.Share/Tools/DataMaskExtensions.cs

@@ -26,12 +26,14 @@ public static class DataMaskExtensions
 
     public static string MaskPhoneNumber(this string original)
     {
+        if (original.IsNullOrEmpty()) return original;
         if (original.Length < 11) return string.Empty;
         return original.Mask(3, 4);
     }
 
     public static string MaskIdCard(this string original)
     {
+        if (original.IsNullOrEmpty()) return original;
         return original.Mask(3, 12);
     }
 }