Thomas ca6eb27232
Don't add remote user to setfacl command, if it doesn't exist as an os user (#2822)
* Update writable.php

Only add the the remote user to setfacl command if he exists as an os user.

* Replace is_int() with !empty().

run() usually returns a string, so the static analyzer throws an error, when using is_int() on its return value.

* Use test() instead of run()

Use test() instead of run to check whether the remote user also exists as an os user.
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