Prevent plpData from being evaluated during do.call

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.40%. Comparing base (2b5f007) to head (2acedb9).

Files	Patch %	Lines
R/LearningCurve.R	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #436 +/- ## =========================================== + Coverage 89.36% 89.40% +0.04% =========================================== Files 49 49 Lines 9835 9835 =========================================== + Hits 8789 8793 +4 + Misses 1046 1042 -4 ```

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