Root missing when declining puer with Collatinus Decliner

[mcorne]

The root is missing when declining puer, o etc. This is the case for the 5 models in https://github.com/cltk/lat_models_cltk/blob/master/lemmata/collatinus/src/modeles.la where the number of characters to remove from the canonical form is null: inv, puer, abraham, alter, miser.

Current behavior:
[('puer', '--s----n-'), ('puer', '--s----v-'), ('um', '--s----a-'), ('i', '--s----g-'), ('o', '--s----d-'), ('o', '--s----b-'), ('i', '--p----n-'), ('i', '--p----v-'), ('os', '--p----a-'), ('orum', '--p----g-'), ('is', '--p----d-'), ('is', '--p----b-')]

Steps to reproduce the behavior with https://github.com/cltk/lat_models_cltk/blob/master/lemmata/collatinus/collected.json:

from cltk.morphology.lat import CollatinusDecliner
decliner = CollatinusDecliner()
print(decliner.decline("puer"))

Expected behavior
[('puer', '--s----n-'), ('puer', '--s----v-'), ('puerum', '--s----a-'), ('pueri', '--s----g-'), ('puero', '--s----d-'), ('puero', '--s----b-'), ('pueri', '--p----n-'), ('pueri', '--p----v-'), ('pueros', '--p----a-'), ('puerorum', '--p----g-'), ('pueris', '--p----d-'), ('pueris', '--p----b-')]

Desktop:
Windows 10 with Python 3.9.7

[mcorne]

Possible fix: in https://github.com/cltk/cltk/blob/master/src/cltk/morphology/lat.py line 122, replace:

returned_roots[model_root_id] = [
    lemma_root[:-deletion] + addition for lemma_root in lemma_roots
 ]

with:

if deletion:
    returned_root = [lemma_root[:-deletion] + addition for lemma_root in lemma_roots]
else:
    returned_root = [lemma_root + addition for lemma_root in lemma_roots]
returned_roots[model_root_id] = returned_root