Fix merging of lists

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 16.76%. Comparing base (f291a54) to head (cfcb016).

Files	Patch %	Lines
R/utils.R	0.00%	10 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #18 +/- ## ========================================== - Coverage 16.89% 16.76% -0.13% ========================================== Files 5 5 Lines 669 674 +5 ========================================== Hits 113 113 - Misses 556 561 +5 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.