Test a trained model with nopbc data calculate also virial error

[TinacciL]

I installed via Docker the 2.0.3 deepmd-kit version for GPU.
I test also the same version with the CPU version installed via conda.

When I test the trained model the code calculated also the viral error but I test and trained the model only without pbc data.

[0] DEEPMD INFO    Virial RMSE        : 6.379999e+00 eV
[0] DEEPMD INFO    Virial RMSE/Natoms : 3.322916e-02 eV

[wanghan-iapcm]

Hello, in this case the virial test does not make sense, one may safely ignore them.

[njzjz]

Fixed in #1314.