fix: When you make a schema with 2 attributes or more the schema is generated and credential definition , but you cannot issue the credential

Description

[Provide a description of the changes in this merge request. What was the problem you were trying to solve? How did you solve it?]

Related issues

[If there are any related issues, please mention them here with links.]

Testing

[Describe any testing you've done on this code. What tests have you run, and what were the results?]

Checklist

• I have updated the documentation (if necessary)
• I have added unit tests for new functionality (if applicable)
• My code follows the style guidelines of this project
• I have tested this code on my local machine before submitting this MR

Reviewers

[Tag any reviewers that you want to review this merge request here.]

Additional Notes

[Add any additional notes or comments you have about this merge request.]

Closes #33 (closed)