@Override
	public String getComment() {
		String comment = record.getString(BookmarkDBAdapter.COMMENT_COL);
		return comment != null ? comment : ""; // NOTE: Old data may have stored null
	}
Returns bookmark type or null if type has been removed.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/bookmark/BookmarkDB.java