empty write_bib() for packages without URL

[bastistician]

To reproduce, call write_bib() for an installed package with no URL in its DESCRIPTION, for example:

knitr::write_bib("gridSVG")

currently produces nothing but an empty line.
This is a regression in knitr 1.44 due to #2264.
The return logic in

knitr/R/citation.R

Line 92 in 0f5a15d

if (is.null(meta$URL)) return(meta)

seems at fault.

[yihui]

Should be fixed now. Thanks for the report! Too bad I didn't catch it sooner since I just made a CRAN release yesterday.

[github-actions]

This old thread has been automatically locked. If you think you have found something related to this, please open a new issue by following the issue guide (https://yihui.org/issue/), and link to this old issue if necessary.