config_panel.py:535:_get_failed_spinner_control:AttributeError: 'VBox' object has no attribute '_failed'

Created by: rathann

Information

Solaar version (solaar --version or git describe --tags if cloned from this repository): 1.0.6
Distribution: Fedora 34
Kernel version (ex. uname -srmo): 5.13.13-200.fc34.x86_64
Output of solaar show:

N/A at this time, will update when original reporter provides it

Describe the bug When clicking unlock/lock "disable keys" for keyboard "mx keys", solaar throws an AttributeError exception.

To Reproduce Steps to reproduce the behavior:

Go to Keyboard settings panel.
Click on lock/unlock icon for keyboard "mx keys".
AttributeError exception is thrown.

Screenshots N/A

Additional context This was reported downstream in Fedora bugzilla as bug #2003483. Python backtrace:

config_panel.py:535:_get_failed_spinner_control:AttributeError: 'VBox' object has no attribute '_failed'

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/solaar/ui/config_panel.py", line 382, in _change_click
    _write_async(setting, persisted, control.get_parent())
  File "/usr/lib/python3.9/site-packages/solaar/ui/config_panel.py", line 44, in _write_async
    failed, spinner, control = _get_failed_spinner_control(sbox)
  File "/usr/lib/python3.9/site-packages/solaar/ui/config_panel.py", line 535, in _get_failed_spinner_control
    return sbox._failed, sbox._spinner, sbox._control
AttributeError: 'VBox' object has no attribute '_failed'

Local variables in innermost frame:
sbox: <Gtk.VBox object at 0x7f3f98d64a80 (GtkVBox at 0x559008a74f90)>