Fix NonType error when importing google.api_core fails

[ihji]

skipIf doesn't work for parameterized arguments since it's executed first.

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[ihji]

R: @ahmedabu98
CC: @pabloem

[codecov]

Codecov Report

Merging #17774 (541dfb3) into master (5bb3127) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #17774      +/-   ##
==========================================
- Coverage   74.01%   74.00%   -0.01%     
==========================================
  Files         695      695              
  Lines       91798    91806       +8     
==========================================
+ Hits        67941    67942       +1     
- Misses      22611    22618       +7     
  Partials     1246     1246              

Flag	Coverage Δ
python	83.74% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
.../python/apache_beam/testing/test_stream_service.py	88.09% <0.00%> (-4.77%)	⬇️
.../python/apache_beam/transforms/periodicsequence.py	96.72% <0.00%> (-1.64%)	⬇️
...che_beam/runners/interactive/interactive_runner.py	89.20% <0.00%> (-1.44%)	⬇️
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	⬇️
sdks/python/apache_beam/transforms/combiners.py	93.05% <0.00%> (-0.39%)	⬇️
...ks/python/apache_beam/runners/worker/operations.py	74.02% <0.00%> (-0.07%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.54% <0.00%> (-0.01%)	⬇️
sdks/python/apache_beam/io/textio.py	96.89% <0.00%> (ø)
...s/python/apache_beam/io/gcp/pubsublite/external.py	0.00% <0.00%> (ø)
.../python/apache_beam/io/gcp/pubsublite/proto_api.py	0.00% <0.00%> (ø)
... and 6 more

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[ahmedabu98]

Do these tests still run if empty params are passed in? Would it be more optimal to skip them entirely? Something like this in the beginning of each affected test:

if exceptions is None:
  self.skipTest("Import fail: google.api_core")

[ihji]

it's already there:

beam/sdks/python/apache_beam/io/gcp/bigquery_test.py

Line 851 in 541dfb3

HttpError is None or exceptions is None,

this pr fixes the error thrown even when the test is marked as skipped.

[ahmedabu98]

Oh I see. This LGTM then.