fix(get_hydrometrie_observations_tr): Error on empty response

Fix #13
2 jobs for master in 1 minute and 25 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Check
passed check #202206
docker

00:01:09

 
  Github
failed github #202207
docker

00:00:16

 
Name Stage Failure
failed
github Github
To github.com:inrae/hubeau.git
- [deleted] gh-pages
* [new branch] refs/pipelines/27663 -> refs/pipelines/27663
* [new branch] refs/pipelines/27664 -> refs/pipelines/27664
* [new branch] origin/master -> origin/master
* [new tag] v0.1.0 -> v0.1.0
! [remote rejected] master (refusing to delete the current branch: refs/heads/master)
error: failed to push some refs to 'git@github.com:inrae/hubeau.git'
Cleaning up file based variables
ERROR: Job failed: exit code 1