Fix FlatMap numpy array bug

[TheNeuralBit]

Fixes #22000

0de9821 introduced a regression when a FlatMap produced an instance of an iterable type that raises an error in __bool__, like numpy arrays. The regression was just caused by a trivial cleanup, which is reverted here.

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[TheNeuralBit]

R: @tvalentyn @robertwb
CC: @pabloem (I would like to cherrypick this, sorry!)

[github-actions]

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[codecov]

Codecov Report

Merging #22006 (19f0c2e) into master (1dff59b) will decrease coverage by 0.14%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master   #22006      +/-   ##
==========================================
- Coverage   74.12%   73.97%   -0.15%     
==========================================
  Files         702      702              
  Lines       93667    92850     -817     
==========================================
- Hits        69431    68689     -742     
+ Misses      22981    22906      -75     
  Partials     1255     1255              

Flag	Coverage Δ
python	83.58% <75.00%> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/runners/common.py	88.59% <75.00%> (-0.10%)	⬇️
sdks/python/apache_beam/utils/interactive_utils.py	95.12% <0.00%> (-2.44%)	⬇️
sdks/python/apache_beam/transforms/core.py	92.57% <0.00%> (-1.72%)	⬇️
...thon/apache_beam/ml/inference/sklearn_inference.py	95.23% <0.00%> (-1.58%)	⬇️
...cp/internal/clients/bigquery/bigquery_v2_client.py	66.82% <0.00%> (-0.97%)	⬇️
sdks/python/apache_beam/transforms/combiners.py	93.05% <0.00%> (-0.39%)	⬇️
sdks/python/apache_beam/ml/inference/base.py	95.37% <0.00%> (-0.38%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.42% <0.00%> (-0.25%)	⬇️
sdks/python/apache_beam/ml/inference/__init__.py	100.00% <0.00%> (ø)
...thon/apache_beam/ml/inference/pytorch_inference.py	0.00% <0.00%> (ø)
... and 4 more

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[pabloem]

LGTM! I suppose you can merge or wait for other reviewers but fix makes sense to me.

[TheNeuralBit]

Thanks, I'm fine merging with your LGTM