[hotfix] The visualization methods for the crop models don't work anymore because of #126

Summary

The visualization methods for the crop models don't work anymore because of #126 (closed) which has improve the output structure of the crop models.

Steps to reproduce

Make run the main.py and example.py files.

What is the current bug behavior?

The methods called do not have anymore access to the output data.

What is the expected correct behavior?

The general function of 3D visualization in DATA_MANAGEMENT should be used.

Possible fixes

The bug is linked to the new feature developed as described in #126 (closed)