Crash on deletion of downloaded files list.

System Details:

Operating System: Linux
Distro: Fedora Linux 35 (Workstation Edition)
Desktop: GNOME 41.1
Persepolis Version: 3.2.0
Installation via: Pip (PyPI)

Crash error message:

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/persepolis/scripts/persepolis.py", line 433, in main
    mainwindow = MainWindow(start_in_tray, persepolis_download_manager, persepolis_download_manager.setting)
  File "/usr/lib/python3.10/site-packages/persepolis/scripts/mainwindow.py", line 1350, in __init__
    dict = download_table_dict[gid]
KeyError: '1f2665dbf47d3c90'

Issue description: I tried to remove the list of the downloaded files from the custom queue and, this happened.

persepolisdm / persepolis

Crash on deletion of downloaded files list. #895