[fix] skip loading empty constants #920

	name: common-windows-x86-64

	on:
	#push:
	# branches: [ master ]
	# paths-ignore: ['.', 'docker/', 'docs/', 'samples/', README.md]
	pull_request:
	branches: [ master ]
	paths-ignore: ['.', 'docker/', 'docs/', 'samples/', README.md,
	'cmake/arm.cmake', 'cmake/cuda.cmake', 'cmake/riscv.cmake',
	'include/ppl/nn/engines/arm/', 'src/ppl/nn/engines/arm/',
	'include/ppl/nn/engines/cuda/', 'src/ppl/nn/engines/cuda/',
	'include/ppl/nn/engines/riscv/', 'src/ppl/nn/engines/riscv/']
	workflow_dispatch:

	concurrency:
	group: ${{ github.workflow }}--${{ github.head_ref \|\| github.run_id }}--${{ github.ref }}--${{ github.event_name }}
	cancel-in-progress: true

	jobs:
	build_and_test:
	runs-on: [self-hosted, x64, windows]

	steps:
	- name: Create Checkout Directory
	run: \|
	cd ../../ ; ./make_pplnn_dir.ps1 ${{ github.run_id }}
	- name: Checkout
	uses: actions/checkout@v2
	with:
	path: ${{ github.run_id }}

	- name: Build
	run: \|
	cd ../../ ; ./build_pplnn.ps1 ${{ github.run_id }} x86_64

	- name: clean
	if: ${{ always() }}
	run: \|
	cd ../../ ; ./clean_pplnn.ps1 ${{ github.run_id }} x86_64

Provide feedback