ByteString.FromBase64 throws with empty strings on the compact framework

What steps will reproduce the problem?
1. Write a program containing the following line: 
Google.ProtocolBuffers.ByteString.FromBase64("");
2. Run it in an emulator using the compact framework.

What is the expected output? What do you see instead?
ByteString.FromBase64("") should return ByteString.Empty. It throws a 
FormatException instead because of the buggy System.Convert.FromBase64String 
implementation in .NETCF 2.0. This causes some JSON deserializations to fail.

What version of the product are you using? On what operating system?
.NETCF 2.0.7045.0 on Pocket PC 2003 and Windows Mobile 6.5.

Please provide any additional information below.

Original issue reported on code.google.com by librema...@gmail.com on 30 Jul 2013 at 7:35

evgenekov / protobuf-csharp-port

ByteString.FromBase64 throws with empty strings on the compact framework #61