fix: add check for empty number of files in dir before scan

[m-rudyk]

Pull Request

Description

Add check for empty folder before scan for case when files not downloaded.

Fixes #399

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• Code cleanup/refactoring
• Documentation update
• This change requires a documentation update
• CI system update
• Test Coverage update

Testing

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

Test Configuration:

• Java: v17
• LPVS Release: v1.x.x

Checklist:

• My code follows the style guidelines of this project
• My code meets the required code coverage for lines (90% and above)
• My code meets the required code coverage for branches (80% and above)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c44618e) 90.81% compared to head (52c3965) 90.75%.

Files	Patch %	Lines
...c/main/java/com/lpvs/service/LPVSQueueService.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #431      +/-   ##
============================================
- Coverage     90.81%   90.75%   -0.06%     
  Complexity      489      489              
============================================
  Files            47       47              
  Lines          1731     1731              
  Branches        207      207              
============================================
- Hits           1572     1571       -1     
  Misses           97       97              
- Partials         62       63       +1     

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[o-kopysov]

LGTM