`pre_release()`: empty items in error message

[pat-s]

https://github.com/cynkra/fledge/commit/8a8520d41e6fe588b076dc97b0c169273efd499e

> fledge::pre_release("minor")
,
, ,
, ,
, ,
, ,
, ,
, , , ,
,
,
, …,
, and
tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-sample-fold-n.svg. Please commit or discard them and
try again.

The items should be some pdfs here:

git status
        modified:   paper/article_files/figure-latex/block-random-1.pdf
        modified:   paper/article_files/figure-latex/block-systematic-1.pdf
        modified:   paper/article_files/figure-latex/buffer-eval-1.pdf
        modified:   paper/article_files/figure-latex/coords-eval-1.pdf
        modified:   paper/article_files/figure-latex/custom-cv-1.pdf
        modified:   paper/article_files/figure-latex/cv-eval-2-1.pdf
        modified:   paper/article_files/figure-latex/disc-eval-1.pdf
        modified:   paper/article_files/figure-latex/env-1-eval-1.pdf
        modified:   paper/article_files/figure-latex/tile-1.pdf
        modified:   paper/article_files/figure-latex/vis-nspcv-eval-1.pdf
        modified:   paper/article_files/figure-latex/vis-spcv-eval-1.pdf
        modified:   paper/pdf/llo.pdf
        modified:   paper/pdf/llto.pdf
        modified:   paper/pdf/lto.pdf

        paper/submission4/
        tests/testthat/_snaps/2-autoplot/repsptcvcstf-2d-space-var-fold-1-2-rep-2.svg
        tests/testthat/_snaps/2-autoplot/repsptcvcstf-2d-space-var-fold-1-rep-2.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-space-var-all-test-sets.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-space-var-fold-1-2.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-space-var-fold-1.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-all-test-sets.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-fold-1-2-rep-2.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-fold-1-2-sample-fold-n.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-fold-1-2.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-fold-1-rep-2.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-fold-1-sample-fold-n.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-fold-1.svg
        tests/testthat/_snaps/2-autoplot/sptcvcstf-2d-time-var-sample-fold-n.svg