fix: bcovrin return emtpy object on issue creadential

Description

Seems like missing TAA acceptance make bcovrin unable to issue credential. Adding this resolves the issue and issuing credentials is not a problem.

Related issues

No related

Testing

Manual testing via Postman requests

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

@alexey.lunin @boyan.tsolov

Additional Notes

Closes #21 (closed)