AttributeError: 'DebugWindow' object has no attribute 'gui_settings'

[sentry-for-tribler]

Sentry Issue: TRIBLER-10V

CreationTraceback: 
  File "run_tribler.py", line 100, in <module>
  File "tribler\gui\start_gui.py", line 77, in run_gui
  File "tribler\gui\utilities.py", line 411, in trackback_wrapper
  File "tribler\gui\tribler_window.py", line 1129, in clicked_debug_panel_button
  File "tribler\gui\debug_window.py", line 97, in __init__
  File "tribler\gui\debug_window.py", line 257, in load_general_tab
  File "tribler\gui\tribler_request_manager.py", line 181, in __init__

AttributeError: 'DebugWindow' object has no attribute 'gui_settings'
  File "tribler\gui\utilities.py", line 414, in trackback_wrapper
  File "tribler\gui\utilities.py", line 411, in trackback_wrapper
  File "tribler\gui\debug_window.py", line 293, in on_tribler_statistics
  File "tribler\gui\debug_window.py", line 301, in show_gui_settings