apps/files_sharing/api/v1/remote_shares/{id} returns empty content for not accepted shares

[individual-it]

Steps to reproduce

1. from server1 share a folder to server2
2. on server2 do not accept the share
3. on server2 find the share-id curl -u admin:admin http://localhost/owncloud-core/ocs/v1.php/apps/files_sharing/api/v1/remote_shares/pending
4. try to get information about that share curl -u admin:admin http://localhost/owncloud-core/ocs/v1.php/apps/files_sharing/api/v1/remote_shares/22 -v

Expected behaviour

Error saying that the share is not accepted
OR
information of the share shown

Actual behaviour

HTTP code 200 but empty content

Server configuration

Operating system:
Ubuntu 18.04
Web server:
Apache2
Database:
SQLite
PHP version:
7.2
ownCloud version: (see ownCloud admin page)
11.0.0
Updated from an older ownCloud or fresh install:
fresh
Where did you install ownCloud from:
git

[individual-it]

possible related to #34566

[ownclouders]

GitMate.io thinks the contributor most likely able to help you is @phil-davis.

Possibly related issues are #34626 (accesing /ocs/v1.php/apps/files_sharing/api/v1/shares with invalid credentials gives an empty reply), #18530 (apps/files_sharing/api/externalShares 404 (Not Found)), #15508 (Empty content notice does not show for shared links), #4435 (Accept incoming shares), and #31423 ([Stable10] api test api sharing v1).

[DeepDiver1975]

@individual-it can you glue all these tests into some api acceptance tests? THX

[individual-it]

@DeepDiver1975 just doing it, trying to fill the gaps in #34566 (comment)
first part was #34627 , more will follow

[individual-it]

log output

{"reqId":"jEUc6cUnaiVutribdDtn","level":3,"time":"2019-03-05T04:33:09+00:00","remoteAddr":"127.0.0.1","user":"admin","app":"PHP","method":"GET","url":"\/owncloud-core\/ocs\/v1.php\/apps\/files_sharing\/api\/v1\/remote_shares\/52","message":"Call to a member function getMimetype() on boolean at \/home\/artur\/www\/owncloud-core\/apps\/files_sharing\/lib\/API\/Remote.php#110"}

[individual-it]

with PHP 5.6 and stable10 that issue results in a HTTP/1.0 500 Internal Server Error

[VicDeo]

still reproducible:

{"reqId":"jeeKxCEMNmITSnccyKE4",
"level":3,
"time":"2020-04-06T10:12:08+00:00",
"remoteAddr":"127.0.0.1",
"user":"admin",
"app":"PHP",
"method":"GET",
"url":"\/ocs\/v1.php\/apps\/files_sharing\/api\/v1\/remote_shares\/32",
"message":"Error: Call to a member function getMimetype() on boolean at \/apps\/files_sharing\/lib\/Controller\/RemoteOcsController.php#213"}

we shouldn't try to read FileInfo for pending shares.