Fix MeshSymmetryErrorHandler treating ISYM=-1 as symmetry ON

[janosh]

7b0c061 fix MeshSymmetryErrorHandler treating ISYM=-1 as symmetry ON
72ac121 PositiveEnergyErrorHandler don't decrease POTIM for static calcs

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04% ⚠️

Comparison is base (26bf28a) 66.19% compared to head (7b0c061) 66.15%.

❗ Current head 7b0c061 differs from pull request most recent head 72ac121. Consider uploading reports for the commit 72ac121 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   66.19%   66.15%   -0.04%     
==========================================
  Files          51       51              
  Lines        5588     5588              
==========================================
- Hits         3699     3697       -2     
- Misses       1889     1891       +2     

Files Changed	Coverage Δ
custodian/vasp/handlers.py	78.68% <100.00%> (ø)

... and 1 file with indirect coverage changes

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