2.99 API: PDB (gimp-vectors-export-string img 0) fails for NULL argument for paths
Symptom is:
Invalid value for argument 1
Expected: docs say that NULL for the paths arg means "export all paths."
Also gimp-vectors-export-file fails the same test.
Reproduce: Test cases in plug-ins/script-fu/test/tests/PDB/vectors-new.scm
Fix is to add none_ok flag on that arg in pdb/groups/vectors.pdb
Probably it used to work, but validation in ScriptFu is more strict since 4fc9daed. Probably only affects ScriptFu scripts, not plugins in other languages.
#9317 (closed) a different bug in the same test case, but for a different cause.