Use safe navigation operator to clean up the codes #5004
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Signed-off-by: Shizuo Fujita <fujita@clear-code.com>
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Which issue(s) this PR fixes:
None.
What this PR does / why we need it:
The safe navigation operator was introduced at Ruby 2.3.
I think it makes the code cleaner.
Docs Changes:
Not needed.
Release Note:
Minor code refactoring