support empty namespace id. (#9) #1

	# Licensed to the Apache Software Foundation (ASF) under one or more
	# contributor license agreements. See the NOTICE file distributed with
	# this work for additional information regarding copyright ownership.
	# The ASF licenses this file to You under the Apache License, Version 2.0
	# (the "License"); you may not use this file except in compliance with
	# the License. You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Publish to crates.io

	on:
	push:
	tags:
	- 'v*'

	jobs:
	publish:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Set up Rust
	uses: actions-rs/toolchain@v1
	with:
	toolchain: stable
	override: true
	- name: Update version in Cargo.toml
	run: \|
	VERSION=$(echo ${{ github.ref }} \| sed 's/refs\/tags\/v//')
	sed -i "s/^version = .*/version = \"$VERSION\"/" Cargo.toml

	- name: Publish to crates.io
	env:
	CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
	run: \|
	cargo publish -p shenyu-client-rust

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