GitLab

* src/lread.c (openp): If exec-path is nil, no files would be
found to execute (bug#30564).

Test cases:

 (let ((exec-path ()))
   (call-process "/bin/ls" nil (current-buffer)))

This would previously fail, but now works.

 (let ((exec-path '("/bin/")))
   (call-process "ls" nil (current-buffer)))

This worked, and still works.