REL: set version to 0.13.2-dev
TST: check number of returned regions

added check on `n` for all tests of label()

(cherry picked from commit bcb81c005eaaa649c596ccfa86f87f91910219c9)
BUG: fix number of regions in case where no regions are found

Added special-case logic for the case were no regions were found so
that 0 is returned instead of 1

Fixes issue #3082

(cherry picked from commit fba0496ebd75b7656864184eb8e73d6b466e855b)