Add possibility to run with 0 PV modules

Summary

Add possibility to run with 0 PV modules (useful for open field simulations, to run a crop model without shading from PV modules).

There must be at least 1 PV module (the lower limit for NumberOfPvPanelsX and Y is 1).

We should be able to input 0 and in configuration.py the instanciation of the 3D scene would skip if there are 0 panels.

Point of attention : we still need a scene as input for the ray casting, how to address that ?

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