fix: allow hydrating thread's channel with an empty members list

[myandrienko]

🚂 #1354

An empty members list should also be used to hydrate a thread's channel. One case when empty members list is meaningful is requesting with member_limit: 0.

[github-actions]

Size Change: +37 B (+0.01%)

Total Size: 427 kB

Filename	Size	Change
dist/browser.es.js	92.5 kB	+11 B (+0.01%)
dist/browser.full-bundle.min.js	54.1 kB	-10 B (-0.02%)
dist/browser.js	93.6 kB	+12 B (+0.01%)
dist/index.es.js	92.6 kB	+11 B (+0.01%)
dist/index.js	93.7 kB	+13 B (+0.01%)

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