[2.1] provide credentials from attestation, even if server doesn't return them

[miken32]

Description

As discussed in #41, the attestation returns a mostly empty result if the server response is empty. Short of re-implementing the function yourself there's no way to get the credentials. This provides the credentials as a return, if the server response is empty.

[DarkGhostHunter]

I believe you will need to write tests for that line, and update the README so everyone knows.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d7d8f2a) to head (ceced6f).
⚠️ Report is 6 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff            @@
##               2.x       #43   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          172       172           
  Branches        50        51    +1     
=========================================
  Hits           172       172           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud