[stable10] #27854 non existing folder skeletondirectory

[Gandolf90]

added new test
throw Exception on false config
catch Exception and write error to Log

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Gandolf90]

@PVince81 cherry-pick done from stable 10 to stable 10. Here we go with the PR

[codecov]

Codecov Report

Merging #29379 into stable10 will decrease coverage by 0.02%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##             stable10   #29379      +/-   ##
==============================================
- Coverage       59.03%   59.01%   -0.03%     
- Complexity      17723    17725       +2     
==============================================
  Files            1060     1060              
  Lines           59411    59415       +4     
==============================================
- Hits            35075    35065      -10     
- Misses          24336    24350      +14

Impacted Files	Coverage Δ	Complexity Δ
lib/private/legacy/util.php	66.66% <100%> (-2.48%)	221 <0> (+1)
lib/private/User/Session.php	63.14% <100%> (+0.52%)	119 <0> (+1)	⬆️

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[phil-davis]

Backport of #29367

[lock]

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