Bugfix: demandait parfois de calculer l'inverse de zéro

1 job for develop in 51 seconds (queued for 1 second)
Status Name Job ID Coverage
failed tox #217706


Name Stage Failure
tox Test

Testing of doctests in the sources finished, look at the results in build/doctest/output.txt.
___________________________________ summary ____________________________________
ERROR: py35: commands failed
ERROR: py36: commands failed
ERROR: py37: commands failed
doc: commands succeeded
doctest: commands succeeded
ERROR: Job failed: exit code 1