[stable-3.8] if parent is null, then do a regular check, no early exit

[backportbot-nextcloud]

backport of #4592

[nextcloud-android-bot]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/11078.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[nextcloud-android-bot]

Lint

Type	stable-3.8	PR
Warnings	58	58
Errors	0	0

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	24
Correctness Warnings	69
Internationalization Warnings	12
Malicious code vulnerability Warnings	4
Multithreaded correctness Warnings	9
Performance Warnings	110
Security Warnings	46
Dodgy code Warnings	137
Total	411

SpotBugs (stable-3.8)

Warning Type	Number
Bad practice Warnings	24
Correctness Warnings	69
Internationalization Warnings	12
Malicious code vulnerability Warnings	4
Multithreaded correctness Warnings	9
Performance Warnings	110
Security Warnings	46
Dodgy code Warnings	137
Total	411

[codecov]

Codecov Report

Merging #4595 into stable-3.8 will decrease coverage by 0.02%.
The diff coverage is 0%.

@@               Coverage Diff                @@
##             stable-3.8    #4595      +/-   ##
================================================
- Coverage         16.99%   16.97%   -0.03%     
  Complexity            1        1              
================================================
  Files               361      361              
  Lines             32000    32133     +133     
  Branches           4511     4546      +35     
================================================
+ Hits               5438     5454      +16     
- Misses            25659    25778     +119     
+ Partials            903      901       -2

Impacted Files	Coverage Δ	Complexity Δ
...cloud/android/ui/helpers/FileOperationsHelper.java	2.39% <0%> (ø)	0 <0> (ø)	⬇️
...cloud/android/ui/preview/PreviewMediaFragment.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...owncloud/android/ui/adapter/OCFileListAdapter.java	29.63% <0%> (+0.19%)	0% <0%> (ø)	⬇️
...cloud/android/ui/activity/FileDisplayActivity.java	19.96% <0%> (+0.23%)	0% <0%> (ø)	⬇️
...loud/android/datamodel/ThumbnailsCacheManager.java	35.76% <0%> (+0.72%)	0% <0%> (ø)	⬇️
.../third_parties/daveKoeller/AlphanumComparator.java	83.33% <0%> (+1.19%)	0% <0%> (ø)	⬇️
.../java/com/owncloud/android/utils/DisplayUtils.java	24.89% <0%> (+1.26%)	0% <0%> (ø)	⬇️
...in/java/com/owncloud/android/utils/ThemeUtils.java	51.57% <0%> (+1.57%)	0% <0%> (ø)	⬇️