do not print virial error with nopbc data

[njzjz]

fix #1286

[codecov-commenter]

Codecov Report

Merging #1314 (daabda0) into devel (843a3c5) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##            devel    #1314      +/-   ##
==========================================
- Coverage   75.62%   75.61%   -0.02%     
==========================================
  Files          91       91              
  Lines        7494     7495       +1     
==========================================
  Hits         5667     5667              
- Misses       1827     1828       +1     

Impacted Files	Coverage Δ
deepmd/entrypoints/test.py	11.48% <0.00%> (-0.06%)	⬇️

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