Added parent_menu to PagedESCMenu and PagedRadioMenu

[ThaPwned]

No description provided.

[ThaPwned]

Yes, thank you! 'Em copy and paste mistakes...

[Ayuto]

Thanks for the PR!

[Mahi]

Not like it really matters, but there are two of these lines:

if not page_index and self.parent_menu is not None:

Both of which should probably explicitly check for page_index == 0 instead of not page_index.

[Ayuto]

True, but if we are already nit picking, we should use a constant like FIRST_PAGE. :P

[Mahi]

I believe you missed my point here. It's not just a semantic change, changing not page to page_index == 0 actually changes the behaviour of the interpreter. If someone were to do something wrong and accidentally managed to set the page_index to an empty list, the not page_index check would evaluate as True.

[satoon101]

Well, playing devil's advocate, if we believe "we're all adults", then if someone decides to change page_index to anything other than an integer, they deserve to have issues.

[Ayuto]

I believe you missed my point here.

No, I got your point. That's why I agreed, but this is really just a minor detail.

Btw. you can't set the page index to something else than an integer. set_player_page() validates the input. But even if you set it to an empty list, you will run into errors when the menu is refreshed.