fix: omit virial in dp test summary if not available

[caic99]

#4563

[Copilot]

Pull Request Overview

This PR updates the test summary output to conditionally include virial statistics only when available in the avg dictionary.

• Replaces if "...".keys() checks with direct key membership tests (if key in avg).
• Adds a guard for printing virial metrics (mae_v, rmse_v, etc.) only if "rmse_v" exists.
• Retains the existing conditional print for Hessian metrics using if "rmse_h" in avg.

Comments suppressed due to low confidence (2)

deepmd/entrypoints/test.py:608

• Add unit tests for cases when virial data is present and when it's absent to ensure these conditional branches behave correctly and no unexpected KeyErrors occur.

    if "rmse_v" in avg:

deepmd/entrypoints/test.py:608

• Guarding only on rmse_v may lead to a KeyError if other virial metrics like mae_v or mae_va exist independently. Consider checking a representative key that covers all virial data, or verify the presence of each metric before printing.

    if "rmse_v" in avg:

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.57%. Comparing base (04da98f) to head (2595c5e).
⚠️ Report is 81 commits behind head on devel.

Files with missing lines	Patch %	Lines
deepmd/entrypoints/test.py	42.85%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #4818   +/-   ##
=======================================
  Coverage   84.57%   84.57%           
=======================================
  Files         699      699           
  Lines       68035    68035           
  Branches     3540     3540           
=======================================
  Hits        57539    57539           
- Misses       9361     9364    +3     
+ Partials     1135     1132    -3     

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