changelog/10.9.0_2021-12-20/39034 from owncloud/core

changelog/10.9.0_2021-12-20/39034

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Bugfix: avoid potential open_basedir errors after upgrade to PHP 7.4.21

PHP 7.4.21 checks open_basedir settings more exactly. Calls to file_exists can
emit log messages like "file_exists(): open_basedir restriction in effect" that
were not emitted by PHP 7.4.20.

This change fixes an incorrect file_exists check. The open_basedir message will
no longer be emitted in this case.

https://github.com/owncloud/core/issues/39034
https://github.com/owncloud/core/pull/39035