[Bug]: Param Validity Checks in Wrong Order

[miqrogroove]

Steps to Reproduce

Execute a step ca certificate command with an invalid file path.

Your Environment

• OS - Ubuntu
• step CLI Version - 0.27.2

Expected Behavior

Check the path params before retrieving a certificate.

Actual Behavior

Step-CLI retrieves a certificate and fails to save it. This creates a situation where a certificate has been issued, transmitted, and now can't be accessed. That certificate needs to be revoked, but the client doesn't even have the serial number.

Additional Context

No response

Contributing

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