fix: get oneListGroup to work as expected for array of strings

[a-rasin]

If I have oneListGroup enabled I would expect that:

{
  "a": ["(first)", "second"]
}

Would give me:

<a>(first)(second)</a>

But I get:

<a>
  <a>(first)</a>
  <a>(second)</a>
</a>

This commit fixes that issue.

Type

Please mention the type of PR

• [X] Bug Fix
• [ ] Refactoring / Technology upgrade
• [ ] New Feature

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