[Tests-Only] Php7.4 fix more tests vol 2

[VicDeo]

Description

• be more explicit while checking if htaccess is a folder
• check array keys existence before accessing them

Related Issue

https://github.com/owncloud/enterprise/issues/3967

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #37297 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master   #37297   +/-   ##
=========================================
  Coverage     64.52%   64.52%           
- Complexity    19161    19165    +4     
=========================================
  Files          1266     1266           
  Lines         74928    74934    +6     
  Branches       1331     1331           
=========================================
+ Hits          48347    48353    +6     
  Misses        26189    26189           
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.68% <100.00%> (+<0.01%)	19165.00 <0.00> (+4.00)

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Setup.php	25.94% <100.00%> (+1.26%)	58.00 <0.00> (+1.00)
lib/private/Share/Share.php	71.05% <100.00%> (+0.03%)	504.00 <0.00> (+3.00)

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