Force maxPoolCapacity to be at least 1

[Heptazhou]

Description

#1421 introduced only an upper-limit but not a lower one. It causes errors in some cases.

This pr shall fix the problem.

Checklist:

• I have followed the Contribution Guidelines
• I have added test code and data to prove that my code functions correctly
• I have verified that new and existing tests pass locally with my changes
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[miguelsousa]

@Heptazhou CI is failing because

./python/afdko/otf2ttf.py:155:80: E501 line too long (89 > 79 characters)
    # Set the pool capacity to be the minimum of file quantity and CPU count, at least 1.
                                                                               ^

[Heptazhou]

@miguelsousa I think it's good to go now.

[miguelsousa]

@Heptazhou the changes look good, but the CI didn't run for some reason. Can you try flatten both commits into just one and force-push?

[Heptazhou]

Sure!

[miguelsousa]

@Heptazhou The CI is still stuck, and I don't know why. Do you mind opening a new PR? Thanks.

[Heptazhou]

No problem.

[Heptazhou]

@miguelsousa see #1530 :D