code: @Override
  	public List<ParsingError> doValidate() {
  
  		List<ParsingError> result = new ArrayList<> ();
  		if( Utils.isEmptyOrWhitespaces( this.msg ))
  			result.add( error( ErrorCode.CMD_EMAIL_NO_MESSAGE ));
  
  		return result;
  	}
docs: /*
  (non-Javadoc)
  @see net.roboconf.core.commands.AbstractCommandInstruction#doValidate()