Releases that shipped before notes were embedded in the appcast
(0.6.2 and earlier) have empty descriptions, so expanding their row
rendered a blank expanse that read as broken. Show a muted "no notes
recorded" line instead; the appcast embed step now runs every release,
so history accumulates from here on.
Tests: vinxi build clean; tsc clean.
Issue: FRE-13
Michael Freno
37a39b59fe