Fix a bug in collapsing data.frame

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 16.21%. Comparing base (856290c) to head (98d9fa6).

Files	Patch %	Lines
R/getResult.R	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #23 +/- ## ========================================== - Coverage 16.25% 16.21% -0.05% ========================================== Files 5 5 Lines 695 697 +2 ========================================== Hits 113 113 - Misses 582 584 +2 ```

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