Fix lyxpak to be Python 3 compatible

[Scott Kostyshak]

On Wed, Dec 06, 2023 at 04:16:10PM +0000, José Matos wrote:
> Based on the error reported on the lyx-users here follows a fix for
> issue reported.
> 
> I took the change and I changed some minor annoyances:
> * test comparison with None;
> * fixed a region where the indentation was different from all the
> others (2 spaces instead of 4);
> * replaced xrange with range.
> 
> Could someone, please, commit this?

Thanks for the quick fix!

It's in master at 9143878e.

Next time, it might be easier if you make the patch with

  git format-patch HEAD^

This way you can add a commit message.

Scott
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