Succeed even if no requirements.txt is present
Will just get default jupyter installation + venv
MODIFY
ubuntu1610-python35-venv/s2i/bin/assemble
ubuntu1610-python35-venv/s2i/bin/assemble
@@ -23,4 +23,6 @@ echo "---> Installing application source..."
cp -Rf /tmp/src/. ./
echo "---> Building application from source..."
+if [ -f requirements.txt ]; then
${APP_DIR}/venv/bin/pip install --no-cache-dir -r requirements.txt
+fi

Succeed even if no requirements.txt is present

Will just get default jupyter installation + venv