FetchContent/ExternalProject: Preserve empty string arguments
Fixes: #20579 (closed)
Topic-rename: fetchcontent-externalproject-empty-args
A GitLab update will be applied on April 24th, between 8am and 10am, EST (UTC-05:00). This site may have intermittent delays during that time.
Fixes: #20579 (closed)
Topic-rename: fetchcontent-externalproject-empty-args