[7.14] TypeError: 'NoneType' object is not subscriptable

[sentry-for-tribler]

Sentry Issue: TRIBLER-1PS

CreationTraceback: 
  File "C:\Users\<relief>\AppData\Local\Programs\Python\Python38\Lib\site-packages\cx_Freeze\initscripts\__startup__.py", line 138, in run
  File "C:\Users\<relief>\AppData\Local\Programs\Python\Python38\Lib\site-packages\cx_Freeze\initscripts\console.py", line 17, in run
  File "src\<relief>\run.py", line 125, in <module>
  File "src\<relief>\run.py", line 121, in main
  File "src\<relief>\gui\start_gui.py", line 84, in run_gui
  File "src\<relief>\gui\tribler_window.py", line 277, in __init__
  File "src\tr...
TypeError: 'NoneType' object is not subscriptable
  File "src\<relief>\gui\utilities.py", line 441, in trackback_wrapper
  File "src\<relief>\gui\utilities.py", line 438, in trackback_wrapper
  File "src\<relief>\gui\widgets\downloadsdetailstabwidget.py", line 215, in on_copy_magnet_clicked