Fixed bug str/type concatenation error
Fixed bug str/type concatenation error

danforthcenter/plantcv,jshoyer/plantcv,AntonSax/plantcv,AntonSax/plantcv,stiphyMT/plantcv,danforthcenter/plantcv,jshoyer/plantcv,stiphyMT/plantcv,stiphyMT/plantcv,danforthcenter/plantcv