update Task.py in Library Management

[zeref02]

for d in frappe.db.sql("""select name, article, article_name, library_member, member_name
    from `tabLibrary Transaction` order by transaction_date desc, modified desc""", as_dict=1):

    if d.article in articles_transacted:
        continue

    if d.transaction_type=="Issue" and date_diff(today, d.transaction_date) > loan_period:
        overdue_by_member.setdefault(d.library_member, [])
        overdue_by_member[d.library_member].append(d)

    articles_transacted.append(d.article)

Here, there is no "transaction_date" and "transaction_type" in the query, but it was used in the following section of the code.