fix install script: check/create docker network

server/install/install.sh

@@ -79,8 +79,7 @@ envsubst < "$TMPFOLDER/server.docker-compose.yml" > "$INSTALL_DIR/docker-compose
 cd "$INSTALL_DIR"
 
 DOCKER_NETWORK_NAME=hostbbq-monitoring-vlan
-docker network inspect ${DOCKER_NETWORK_NAME} > /dev/null 2>&1; EC=$?
-if [[ $EC -ne 0 ]]; then
+if ! docker network inspect ${DOCKER_NETWORK_NAME} > /dev/null 2>&1; then
   if [[ "${COMMAND}" == "up" ]]; then
     echo "⭐ Creating network '${DOCKER_NETWORK_NAME}'..."
     docker network create --subnet=172.20.5.0/24 "${DOCKER_NETWORK_NAME}"