Fixed missing capture validation

        with open(db_path, 'w') as outfile:

            yaml.safe_dump(capture_state, outfile)

    def validate_captures(self, capture_list):

        # Purge captures with missing data files

        valid_captures = []

        for capture in capture_list:

            if capture.file_exists:

                valid_captures.append(capture)

        return valid_captures

    def load_capture_db(self, db_path):

        if os.path.isfile(db_path):

            # Load list of capture dictionary representations from db_path

                capture_dict_list = yaml.load(infile)

            # Create capture object list, and validate captures

            capture_list = self.validate_captures(

                [capture_from_dict(capture_dict) for capture_dict in capture_dict_list]

            )

            capture_list = []

            for capture_dict in capture_dict_list:

                if os.path.isfile(capture_dict['path']):

                    capture_list.append(capture_from_dict(capture_dict))

            return capture_list