[BEAM-12445] Handle none bq_client

[angoenka]

Handling the case when google.cloud.bigquery import fails

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[angoenka]

R: @pabloem
R: @chamikaramj
R: @ihji

[ihji]

Yeah, looks like the API also allows str argument: https://github.com/googleapis/python-bigquery/blob/v1.26.1/google/cloud/bigquery/client.py#L2605

Thanks, LGTM.

[angoenka]

Thanks! Updated the test case. Will merge once the test pass.

[codecov]

Codecov Report

Merging #15194 (dac16b1) into master (c499c49) will decrease coverage by 0.01%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master   #15194      +/-   ##
==========================================
- Coverage   83.84%   83.83%   -0.02%     
==========================================
  Files         441      441              
  Lines       59706    59706              
==========================================
- Hits        50059    50052       -7     
- Misses       9647     9654       +7     

Impacted Files	Coverage Δ
sdks/python/apache_beam/io/gcp/bigquery_tools.py	87.33% <33.33%> (-0.15%)	⬇️
sdks/python/apache_beam/utils/interactive_utils.py	92.68% <0.00%> (-2.44%)	⬇️
...hon/apache_beam/runners/direct/test_stream_impl.py	94.02% <0.00%> (-2.24%)	⬇️
sdks/python/apache_beam/internal/metrics/metric.py	86.17% <0.00%> (-1.07%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.39% <0.00%> (-0.38%)	⬇️
sdks/python/apache_beam/transforms/util.py	95.81% <0.00%> (-0.17%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.85% <0.00%> (-0.16%)	⬇️
...eam/runners/interactive/interactive_environment.py	90.70% <0.00%> (+0.37%)	⬆️
...runners/interactive/display/pcoll_visualization.py	85.78% <0.00%> (+0.52%)	⬆️
...pache_beam/runners/interactive/interactive_beam.py	76.59% <0.00%> (+1.06%)	⬆️

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