Merge pull request #263 from oda-hub/hotfix-docker-build-1

Fix no requirements case

Author: dsavchenko

nb2workflow/templates/Dockerfile.jinja

@@ -39,7 +39,7 @@ RUN micromamba install -y -n base -c conda-forge python={{ default_python_versio
     micromamba clean --all --yes
 {% endif %}
 ARG MAMBA_DOCKERFILE_ACTIVATE=1
-RUN [[ -f /repo/requirements.txt ]] && pip install -r /repo/requirements.txt
+RUN [ -f /repo/requirements.txt ] && pip install -r /repo/requirements.txt || :
 {% endif %}
 
 RUN pip install {{ nb2w_version_spec }}