fix micro/f1_without_tn in RE taskmodule

[ArneBinder]

This allows WrappedMetricWithPrepareFunction to work with metrics from torchmetrics with empty batches (e.g. torchmetrics.F1Score crashes in these cases). We check if an input is an empty batch and do not call forward/update in these cases (in the case of forward we return None).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.35294% with 3 lines in your changes missing coverage. Please review.

Project coverage is 95.61%. Comparing base (e8c7520) to head (92cef1b).

Files with missing lines	Patch %	Lines
...es/metrics/wrapped_metric_with_prepare_function.py	82.35%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
- Coverage   95.66%   95.61%   -0.05%     
==========================================
  Files          61       61              
  Lines        5093     5107      +14     
==========================================
+ Hits         4872     4883      +11     
- Misses        221      224       +3     

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