bibxml7: organizations as "authors" when authors are already listed

[ajeanmahoney]

Describe the issue

bibxml7 entries list the organization as a separate "author" even when there are authors listed. For example:

      <author fullname="J. Jones" surname="Jones">
        <organization>Acme Corp.</organization>
      </author>
      <author fullname="J. Smith" surname="Smith"/>
      <author>
        <organization>NIST</organization>
      </author>

However, if a document has one or more authors, the organization should not be listed as a separate author in the reference entry. That is, the author info should look like this (organization information for the authors themselves is optional):

      <author fullname="J. Jones" surname="Jones">
        <organization>Acme Corp.</organization>
      </author>
      <author fullname="J. Smith" surname="Smith"/>

If the document does not list authors or editors, then organization information can be used:

      <author>
        <organization>NIST</organization>
      </author>

Some more info can be found in the Style Guide: https://www.rfc-editor.org/rfc/rfc7322#section-4.8.6.6

See the following for bibxml7 examples where both authors and organizations are listed: https://bib.ietf.org/public/rfc/bibxml7/reference.DOI.10.6028/NIST.FIPS.180-4.xml https://bib.ietf.org/public/rfc/bibxml7/reference.DOI.10.1145/2208917.2209336.xml https://bib.ietf.org/public/rfc/bibxml7/reference.DOI.10.1145/99517.99553.xml https://bib.ietf.org/public/rfc/bibxml7/reference.DOI.10.1145/242896.242897.xml https://bib.ietf.org/public/rfc/bibxml7/reference.DOI.10.1109/PV.2013.6691439.xml https://bib.ietf.org/public/rfc/bibxml7/reference.DOI.10.1109/INFCOMW.2014.6849240.xml https://bib.ietf.org/public/rfc/bibxml7/reference.DOI.10.1007/3-540-60865-6_43.xml

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