To fix the error of referencing a non-existent variable.

[kacperpaczos]

I added a condition in set_button_label because if we set has_button_label to False and then use set_button_label, we will encounter an exception.

kacper@kacper-VirtualBox:~$ cinnamon-settings themes
/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py:442: DeprecationWarning: Gtk.Window.set_wmclass is deprecated
self.window.set_wmclass(wm_class, wm_class)
Loading Themes module
/home/kacper/.local/share/themes does not exist! Skipping
Mint-Y-Sand
dupa
Traceback (most recent call last):
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 793, in
window = MainWindow()
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 314, in init
if self.load_sidepage_as_standalone():
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 448, in load_sidepage_as_standalone
self.go_to_sidepage(sp_data.sp, user_action=False)
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 174, in go_to_sidepage
sidePage.build()
File "/usr/share/cinnamon/cinnamon-settings/bin/SettingsWidgets.py", line 212, in build
self.module.on_module_selected()
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 187, in on_module_selected
self.icon_chooser = self.create_button_chooser(self.settings, 'icon-theme', 'icons', 'icons', button_picture_size=ICON_SIZE, menu_pictures_size=ICON_SIZE, num_cols=4)
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 722, in create_button_chooser
self.set_button_chooser(chooser, theme, path_prefix, path_suffix, button_picture_size)
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 726, in set_button_chooser
self.set_button_chooser_text(chooser, theme)
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 748, in set_button_chooser_text
chooser.set_button_label(theme)
File "/usr/share/cinnamon/cinnamon-settings/bin/ChooserButtonWidgets.py", line 135, in set_button_label
self.button_label.set_markup(label)
AttributeError: 'PictureChooserButton' object has no attribute 'button_label'. Did you mean: 'button_box'?
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 153, in apport_excepthook
with os.fdopen(os.open(pr_filename,
FileNotFoundError: [Errno 2] Nie ma takiego pliku ani katalogu: '/var/crash/_usr_share_cinnamon_cinnamon-settings_cinnamon-settings.py.1000.crash'

Original exception was:
Traceback (most recent call last):
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 793, in
window = MainWindow()
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 314, in init
if self.load_sidepage_as_standalone():
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 448, in load_sidepage_as_standalone
self.go_to_sidepage(sp_data.sp, user_action=False)
File "/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", line 174, in go_to_sidepage
sidePage.build()
File "/usr/share/cinnamon/cinnamon-settings/bin/SettingsWidgets.py", line 212, in build
self.module.on_module_selected()
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 187, in on_module_selected
self.icon_chooser = self.create_button_chooser(self.settings, 'icon-theme', 'icons', 'icons', button_picture_size=ICON_SIZE, menu_pictures_size=ICON_SIZE, num_cols=4)
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 722, in create_button_chooser
self.set_button_chooser(chooser, theme, path_prefix, path_suffix, button_picture_size)
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 726, in set_button_chooser
self.set_button_chooser_text(chooser, theme)
File "/usr/share/cinnamon/cinnamon-settings/modules/cs_themes.py", line 748, in set_button_chooser_text
chooser.set_button_label(theme)
File "/usr/share/cinnamon/cinnamon-settings/bin/ChooserButtonWidgets.py", line 135, in set_button_label
self.button_label.set_markup(label)
AttributeError: 'PictureChooserButton' object has no attribute 'button_label'. Did you mean: 'button_box'?