Discard unused variables
Discard unused variables

* Used _ instead of i when i is not used
* Created empty arrays to build dataframe columns to remove the if/else block

danforthcenter/plantcv,stiphyMT/plantcv,stiphyMT/plantcv,danforthcenter/plantcv,stiphyMT/plantcv,danforthcenter/plantcv