Pydantic complains about missing email

[flrnslbch]

Describe the bug
The person idenfication heuristics give the impression that the email address is optional when specifying people. This is also necessary, if an author wishes to be listed by name only.
However, when I omit the email address in somesy.toml, I get the following error:

Error: 1 validation error for SomesyInput                                                                                                                                                                                     
project.people.3.email                                                                                                                                                                                                        
  Field required                                                                                                                                                                                                              
    For further information visit https://errors.pydantic.dev/2.5/v/missing   

To Reproduce

Run somesy sync on an input file that contains a person for which no email is supplied.

Expected behavior
No email is listed for this person in the output files

Environment
Provide information about versions of relevant software packages.

• Python Version 3.10
• Ubuntu 22.04
• pydantic version 2.5.3

[mustafasoylu]

Most of the Author metadata like in pyproject.toml requires an email since their format is author_full_name <euthor_email>. Therefore, we made family names, given names, and email required fields. In person heuristics, what we would like to have is actually an orcid profile, which is better for recognizing humans since emails change with affiliation too.

[flrnslbch]

Neither pyproject nor CITATION.cff require an email. I do not understand why somesy needs to be stricter than the output standards. For privacy reasons and/or to avoid spam authors may choose to not supply an email adress which in my opinion should be respected. Please consider reopening this issue.

[mustafasoylu]

Talked about this again and we agreed on there are use cases where email cannot be provided. Will be implemented on the next cycle