YADE execution can hangs when FTP Pre/Post commands are used

Current Situation

YADE FTP client hangs when:

• FTP command is wrong
• FTP command has been accepted, but the requested action is being held in abeyance, pending receipt of further information.
  • Example: RNFR ... RNTO (see https://en.wikipedia.org/wiki/List_of_FTP_commands)

Desired Behaivior

• Should throw an exception if command execution failed ( raise_exception_on_error = true)
• Should log an exception if command execution failed ( raise_exception_on_error = false)
• Should execute all commands, when the previous commands has been accepted