## What changes were proposed in this pull request?

Avoid NPE in KinesisRecordProcessor when shutdown happens without successful init

## How was this patch tested?

Existing tests

Author: Sean Owen <sowen@cloudera.com>

Closes #15882 from srowen/SPARK-18400.

(cherry picked from commit 43a26899)
Signed-off-by: Sean Owen <sowen@cloudera.com>