Cannot generate a .pdf file if there are no external references

[AlisdairM]

When collecting and forming the references at the end of the document, the pdf rendering cannot handle an empty set of references, while the html rendering has no trouble with such cases. A typical error that is reported when trying to generate a .pdf looks like:

% make RegularNullablePointer.pdf. // <-- command line

pandoc RegularNullablePointer.md -o generated/RegularNullablePointer.pdf -d ./data/defaults.yaml --bibliography ./data/csl.json
Error producing PDF.
! LaTeX Error: Command \CSLBlock undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type H for immediate help.
...

l.98 \renewcommand{\CSLBlock}

make: *** [generated/RegularNullablePointer.pdf] Error 43

[ContingencyOfTautologicalContradictions]

Same issue here

[ContingencyOfTautologicalContradictions]

I could apparently solve the error by removing the line 35 of wg21/data/metadata.yaml