Add error handling for malfoemed author

[yamagen0915]

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Issue

Fixes #1143.

In my case, I got the same error when I set empty string on author.

# poetry install
Installing dependencies from lock file

No dependencies to install or update


[AttributeError]
'NoneType' object has no attribute 'group'

I just fixed for now to return None.
Please tell me another approach if this is not appropriate fix.

[finswimmer]

Hello @yamagen0915,

thanks a lot for your contribution!

I think instead of just returning None values, we should raise a ValueError with your descriptive message. I'm afraid many users will not read the console output and will wonder why their author isn't in the metadata. So we should follow the principal of "fail fast".

fin swimmer

[yamagen0915]

@finswimmer
Thanks for the review!
I have fixed. 6a0ac4a

[finswimmer]

Good job 👍 Thanks a lot.

[github-actions]

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