fix(settings): posix_getpwuid can return false which should not be accessed like an array
#43334
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Summary
When
fileowneris false or the user can not read/etc/passwd(SELinux etc) thenposix_getpwuidwill fail and returnfalsewhich of cause should not be accessed likefalse['user'].This is one of the errors reported in the log of nextcloud/notifications#2267
Checklist