Update h2d.py

[rogelio-basurto]

Used a formatter: yapf.

Also, fixed a bug in the links section. If does not had an 'href', it had problems.

Also, changed the table creation, so checks the max number of columns, when you have merged elements.

Added a fix in the color elements in case it has some trash (I got an html with \n all over).

[sanjass]

I also encountered issues in cases where href is missing from <a> tags, I believe this PR will address that. @pqzx can the PR be reviewed and merged?

[vikramsoni2]

The issue still persists. And the maintainers are holding on to it merge for more than a year