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Sean Owen authored
## What changes were proposed in this pull request?

Avoid `NoSuchElementException` every time `ConfigProvider.get(val, default)` falls back to default. This apparently causes non-trivial overhead in at least one path, and can easily be avoided.

See https://github.com/apache/spark/pull/17329

## How was this patch tested?

Existing tests

Author: Sean Owen <sowen@cloudera.com>

Closes #17567 from srowen/SPARK-19991.
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