Fix reading empty files from objectstorage

[rullzer]

Since we try to do range requests this will fail hard.
However since empty files are not that interesting to read anyways we
just read from an emptry memory stream.

Signed-off-by: Roeland Jago Douma [email protected]

[MorrisJobke]

🙈

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 32902: failure

mariadb10.1-php7.2

Show full log

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) OCA\DAV\Tests\unit\CardDAV\CardDavBackendTest::testSearch with data set #0 ('John', array('FN'), array(), array(array('uri0', 'John Doe'), array('uri1', 'John M. Doe')))
Failed asserting that 1 is identical to 2.

/drone/src/apps/dav/tests/unit/CardDAV/CardDavBackendTest.php:746

[rullzer]

/backport to stable19

[rullzer]

/backport to stable18