[CU-862j5xat0] fix: drilldown fail

[cyp3rius]

Ticket

https://github.com/VirtusLab/strapi-plugin-comments/issues/187

Summary

What does this PR do/solve?

Solves issue with Drilldown if we've got admin responses only in the thread.

Test Plan

1. Run the app
2. Create a threads directly from Moderation panel
3. See that all is working as well as custom formatting (bold, italic, underline)

[cyp3rius]

Task linked: CU-862j5xat0 Drilldown fails for admin comments

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (develop@6134f1e). Click here to learn what that means. The diff coverage is n/a.

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@@            Coverage Diff             @@
##             develop     #188   +/-   ##
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  Coverage           ?   79.36%           
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  Files              ?       34           
  Lines              ?      882           
  Branches           ?      294           
==========================================
  Hits               ?      700           
  Misses             ?      179           
  Partials           ?        3           

Flag	Coverage Δ
unittest	79.36% <0.00%> (?)

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