MDS: Adjust SupportedCtapOptions parsing logic

[fdennis]

[github-actions[bot]]

Test Results

2 271 tests   2 263 ✅  1m 3s ⏱️    46 suites      8 💤    46 files        0 ❌

Results for commit a94d1481.

:recycle: This comment has been updated with latest results.

[emlun]

Out of curiosity I tried what happens if you add the aforementioned test of parsing from an empty JSON object, and it turned out to have wider repercussions than I expected :smile: it also interacts with the builder annotations in subtle ways. I'll post a meta-PR with what I found.

[gwohong]

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