Fix PostgreSQL Cidr#change?: NoMethodError: undefined method `prefix' for nil #51758
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Motivation / Background
This Pull Request has been created because fixes an error.
Steps to reproduce are below comments.
#51633 (comment)
Detail
PostgreSQL Cidr#change? raise an error of NoMethodError: undefined method `prefix' for nil, when creating a record with an empty value of inet/cidr column.
This Pull Request changes fixes the error and adds a test case.
Additional information
Checklist
Before submitting the PR make sure the following are checked:
[Fix #issue-number]