Cease encapsulating exceptions in MySql batcher, it prevents exception translation.

Author: fredericDelaporte

src/NHibernate/AdoNet/MySqlClientSqlCommandSet.cs

@@ -51,24 +51,17 @@ public void Dispose()
 
 		public int ExecuteNonQuery()
 		{
-			try
+			if (CountOfCommands == 0)
 			{
-				if (CountOfCommands == 0)
-				{
-					return 0;
-				}
-
-				return doExecuteNonQuery(instance);
-			}
-			catch (Exception exception)
-			{
-				throw new HibernateException("An exception occured when executing batch queries", exception);
+				return 0;
 			}
+
+			return doExecuteNonQuery(instance);
 		}
 
 		public int CountOfCommands
 		{
 			get { return countOfCommands; }
 		}
 	}
-}
+}