child Window Don't can use meter

[gtgor]

Desktop (please complete the following information):

I needed to use meter in a child window, and the program threw an error, which I assumed was due to a default conflict

Describe the bug

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python310\lib\tkinter_init_.py", line 1921, in call
return self.func(*args)
File "C:\Projects\alloy\venv\lib\site-packages\ttkbootstrap\widgets.py", line 953, in _on_theme_change
self._draw_base_image()
File "C:\Projects\alloy\venv\lib\site-packages\ttkbootstrap\widgets.py", line 862, in _draw_base_image
self._set_widget_colors()
File "C:\Projects\alloy\venv\lib\site-packages\ttkbootstrap\widgets.py", line 773, in _set_widget_colors
self._meterbackground = Colors.update_hsv(background, vd=-0.1)
File "C:\Projects\alloy\venv\lib\site-packages\ttkbootstrap\style.py", line 369, in update_hsv
r, g, b = Colors.hex_to_rgb(color)
File "C:\Projects\alloy\venv\lib\site-packages\ttkbootstrap\style.py", line 317, in hex_to_rgb
r, g, b = colorutils.color_to_rgb(color)
TypeError: cannot unpack non-iterable NoneType object

To Reproduce

I managed to repeat the mistake in a new dame

import ttkbootstrap as ttk
def windows1():
root=ttk.Window()
ttk.Button(root,command=lambda : windows2()).pack()
root.mainloop()

def windows2():
win=ttk.Window()
ttk.Meter(win).pack()
win.mainloop()
windows1()

Expected behavior

In general, mater can be successfully deployed on win

Screenshots

No response

Additional context

No response

[gtgor]

windows11 python3.10