FIX: if multiple updates for one entity exist, the retrieve would result in an...

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.docker/Dockerfile

@@ -25,7 +25,7 @@ ADD https://gitlab.com/api/v4/projects/13656973/repository/branches/dev \
 RUN git clone https://gitlab.com/caosdb/caosdb-pylib.git && \
    cd caosdb-pylib && git checkout dev && pip3 install .
 # At least recommonmark 0.6 required.
-RUN pip3 install -U html2text pycodestyle pylint recommonmark sphinx-rtd-theme
+RUN pip3 install -U html2text pycodestyle pylint recommonmark sphinx-rtd-theme gitignore-parser
 COPY . /git
 RUN rm -r /git/.git \
     && mv /git/.docker/pycaosdb.ini /git/integrationtests