HL inferfaces: don't create train-test collectors if not training

[MischaPanch]

Minor fix/extension

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.43%. Comparing base (94e097b) to head (ca7a7ab).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1208   +/-   ##
=======================================
  Coverage   85.43%   85.43%           
=======================================
  Files         102      102           
  Lines        8667     8674    +7     
=======================================
+ Hits         7405     7411    +6     
- Misses       1262     1263    +1     

Flag	Coverage Δ
unittests	85.43% <100.00%> (+<0.01%)	⬆️

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[opcode81]

LGTM