THRIFT-1132. csharp: Deserialization error in TApplicationException C#

Add in a missing ReadStructBegin call.

Patch: Wojciech Baćmaga

git-svn-id: https://svn.apache.org/repos/asf/thrift/trunk@1090392 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/csharp/src/TApplicationException.cs b/lib/csharp/src/TApplicationException.cs
index cc29f0a..57dd375 100644
--- a/lib/csharp/src/TApplicationException.cs
+++ b/lib/csharp/src/TApplicationException.cs
@@ -52,6 +52,7 @@
 			string message = null;
 			ExceptionType type = ExceptionType.Unknown;
 
+			iprot.ReadStructBegin();
 			while (true)
 			{
 				field = iprot.ReadFieldBegin();