It should fix the following stacktrace:
```
[2021-02-18 14:46:14,771] ERROR {cps:1891} Exception on / [GET]
Traceback (most recent call last):
File "/opt/calibre/vendor/flask/app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "/opt/calibre/vendor/flask/app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/opt/calibre/vendor/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/opt/calibre/vendor/flask/_compat.py", line 39, in reraise
raise value
File "/opt/calibre/vendor/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/opt/calibre/vendor/flask/app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/opt/calibre/cps/usermanagement.py", line 38, in decorated_view
return login_required(func)(*args, **kwargs)
File "/opt/calibre/vendor/flask_login/utils.py", line 272, in decorated_view
return func(*args, **kwargs)
File "/opt/calibre/cps/web.py", line 719, in index
return render_books_list("newest", sort_param, 1, page)
File "/opt/calibre/cps/web.py", line 422, in render_books_list
entries, random, pagination = calibre_db.fill_indexpage(page, 0, db.Books, True, order)
File "/opt/calibre/cps/db.py", line 610, in fill_indexpage
return self.fill_indexpage_with_archived_books(page, pagesize, database, db_filter, order, False, *join)
File "/opt/calibre/cps/db.py", line 635, in fill_indexpage_with_archived_books
# book = self.order_authors(book)
UnboundLocalError: local variable 'entries' referenced before assignment
```
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