Fix problem which caused freeze when torrent-client wasn't working properly

Author: witcher112

src/Assets/Scripts/Net/TorrentClient.cs

@@ -52,12 +52,22 @@ private string ReadCommandResult()
 
             while (!str.ToString().EndsWith("#=end"))
             {
+                ThrowIfProcessExited();
+
                 str.Append((char)_stdOutput.Read());
             }
 
             return str.ToString().Substring(0, str.Length - 5);
         }
 
+        private void ThrowIfProcessExited()
+        {
+            if (_process.HasExited)
+            {
+                throw new Exception("torrent-client process has exited");
+            }
+        }
+
         private StreamReader CreateStdOutputStream()
         {
             return new StreamReader(_process.StandardOutput.BaseStream, CreateStdEncoding());