Running local_test exits quietly after bindings test

[fsimonis]

Versions

$ docker --version
Docker version 18.09.7, build 2d0083d
$ docker-compose --version
docker-compose version 1.25.4, build 8d51620a
$ python --version
Python 3.7.4

Systemtests commit: dfca1db

Log:

$ python local_test.py --branch=bugfix-v2.0.1
--->8---
Successfully tagged st_precice-dockerfile.ubuntu1604.home-bugfix-v2.0.1:latest

Starting system test bindings.Ubuntu1604.home

EXECUTING: docker build --network=host --file Dockerfile --tag st_bindings-dockerfile.ubuntu1604.home-bugfix-v2.0.1 --build-arg from=st_precice-dockerfile.ubuntu1604.home-bugfix-v2.0.1:latest .
--->8---
Successfully tagged st_bindings-dockerfile.ubuntu1604.home-bugfix-v2.0.1:latest
EXECUTING: docker run -it -d --name st_bindings-dockerfile.ubuntu1604.home-bugfix-v2.0.1 st_bindings-dockerfile.ubuntu1604.home-bugfix-v2.0.1
d3e129ccedce42f4377dc012e45ace049f840bc455ffb6a9f4de872c392010b8
EXECUTING: docker cp st_bindings-dockerfile.ubuntu1604.home-bugfix-v2.0.1:Output . 
TEST SUCCEEDED - No difference to referenceOutput found.
$ 

Steps to reproduce:

1. delete all st_ docker images and running containers
2. run: python local_test.py --branch=bugfix-v2.0.1