[Spring] Fix clear config file pattern with empty string

[ninpan-ms]

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[azure-client-tools-bot-prd]

Validation for Breaking Change Starting...

Thanks for your contribution!

[azure-client-tools-bot-prd]

Hi @ninpan-ms,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[azure-client-tools-bot-prd]

Hi @ninpan-ms,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

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[github-actions]

Hi @ninpan-ms

⚠️ Release Requirements

Module: spring

• ⚠️ Please update VERSION to be 1.29.0 in src/spring/setup.py

Notes

• For more info about extension versioning, please refer to Extension version schema