[stable19] Do not fail if share for mountpoint is no longer available

[juliushaertl]

Backport of #22557

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 32836: failure

mariadb10.4-php7.3

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There were 2 warnings:

1) Test\Files\ViewTest::testRenameFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

2) Test\Files\ViewTest::testCopyFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

--

There was 1 failure:

1) Test\Share20\DefaultShareProviderTest::testGetSharedWithUserWithNode with data set #0 ('home::shareOwner', 'files/test.txt', 'files/test2.txt')
Failed asserting that '62' matches expected 0.

/drone/src/tests/lib/Share20/DefaultShareProviderTest.php:1169

mysql8.0-php7.2

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There were 2 warnings:

1) Test\Files\ViewTest::testRenameFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

2) Test\Files\ViewTest::testCopyFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

--

There was 1 failure:

1) Test\Share20\DefaultShareProviderTest::testGroupDeleted with data set #1 (array(0, 'user', array()), 'user', false)
Failed asserting that actual size 0 matches expected size 1.

/drone/src/tests/lib/Share20/DefaultShareProviderTest.php:2435