Author entry without orcid key leads to Undefined control sequence

Hi,

with latest texlive, using latexmk -lualatex main I get Undefined control sequence errors if metadata/authors.tex defines an author entry without an orcid id (uncomment one of the lines in authors.tex that defines the orcid key to reproduce). In the case of the template the PDF is still produced, so it is not a major issue, but I thought it would be better to report this.

Best, Philipp

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