parseOAuthPersistBlob already returns null for {} (the server's
missing-file response) and for a literal null body, so the
Object.keys(store).length === 0 guard was redundant — and would throw a
TypeError on a null body before parseOAuthPersistBlob could handle it.
Pass the parsed res.json() straight through.
Addresses Claude review item #1 on #1612.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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