fix: save production data with empty temp_documentation.json

[AZabolotnikov]

Description

Fix issue where parallel tests cannot write to temp_documentation.json. If this file is empty or does not exist then json_decode('', true) returns null.

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)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• 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
• [] Any dependent changes have been merged and published in downstream modules

[DenTray]

@AZabolotnikov please refactor testMergeTempDocumentation as well

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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