Conformance test issue -- discovery test GET request to missing manifest should yield 200

[MinerYang]

DEBUG 
==============================================================================
~~~ REQUEST ~~~
GET  /v2/conformance/testrepo/referrers/sha256:a451f356992d5e442d10dcb3960a811ccdbfc6b6c3b637468f5f2e3f4280dd1b  HTTP/1.1
HOST   : 10.202.250.166
HEADERS:
	Authorization: Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IlRYRDI6Q09URTpOWk1EOkZQTVo6QlJFVTpWQ1czOjdDTTQ6UEtOTjo2UUhLOkdINTQ6SkRJMzpDRkxFIiwidHlwIjoiSldUIn0.eyJpc3MiOiJoYXJib3ItdG9rZW4taXNzdWVyIiwic3ViIjoiYWRtaW4iLCJhdWQiOiJoYXJib3ItcmVnaXN0cnkiLCJleHAiOjE3MDg1ODYyMTIsIm5iZiI6MTcwODU4NDQxMiwiaWF0IjoxNzA4NTg0NDEyLCJqdGkiOiJDMkY4Qks0VGJsYlAzN3ZnIiwiYWNjZXNzIjpbeyJ0eXBlIjoicmVwb3NpdG9yeSIsIm5hbWUiOiJjb25mb3JtYW5jZS90ZXN0cmVwbyIsImFjdGlvbnMiOlsiZGVsZXRlIiwicHVsbCIsInB1c2giXX1dfQ.HTZFUyoE3P7_X10zlj-LdP5PvqrJ8hTjTp2Pgz8enmdBvPvtUXvsgaQREQj1bOq0d0BukThtbWEAIRKn1VGcB-9id4dv7PiNe20j7_pzs-snrpZFFlwbjXxEZf4OflLELKTK5j0ybJMLCA7H6JmUrD8wrewKflBjoy8N3tr8iAntNVt_pVO92NeD47eTYC1llgLwi5x-gD7DNWDl_Dcpr1KmOhGQ1Bn6t-u4Ti_F41vB9UbnnVoocDNT7TVaE_CIYercKT7Zh-mPXil_vVHSdWe4bFr6DX67UQJkyinnzF8qa4a6Rwp8vUR2VMoQ0sGSUu0aTx0z_6TUmuleCm_x-Rmcrumse2tj67ZQeJ9tHgr7uOZ4D2kaJmk76cJpiONnaJ0ZQj41KUIg-wDq7V8Z3YmniIvHSVuhhEi0hqP6UQ3LT0PDIfdpyby2b5mii0y4Wv8nwMGJb-oKk3i8LO8kLCydOgy6cJCysw1GzVPjnyALF1cEJ025JU_QrjT97PGJY8nhnBQb_jKmfIYKmfldvKTpDuqpWxibulVgdu7i91CpQMGuFAlnsyIzoY4U3A-uUtwsZgy6gkyGHIZtpJqPDek4BDks9QevItcU_ENVoS1NcQUi0720RuLaAqMwRxCeuLN36DxqD1SYAJyiBHSOf1qz5Vad2lvR5tlnh2yGfH0
	User-Agent: distribution-spec-conformance-tests
BODY   :
***** NO CONTENT *****
------------------------------------------------------------------------------
~~~ RESPONSE ~~~
STATUS       : 200 OK
PROTO        : HTTP/1.1
RECEIVED AT  : 2024-02-22T06:46:52.932890254Z
TIME DURATION: 3.830268ms
HEADERS      :
	Connection: keep-alive
	Content-Length: 3
	Content-Security-Policy: frame-ancestors 'none'
	Content-Type: application/vnd.oci.image.index.v1+json
	Date: Thu, 22 Feb 2024 06:46:52 GMT
	Server: nginx
	Set-Cookie: sid=39b9912b47825cbacbc6e9a2fe3b5fda; Path=/; HttpOnly
	Strict-Transport-Security: max-age=31536000; includeSubdomains; preload
	X-Frame-Options: DENY
	X-Request-Id: 9f10499c-8987-4bce-a22c-8786d2481bd9
	X-Total-Count: 0
BODY         :
{}

==============================================================================

Expected
: 0
to equal
: 1