hashchange: Fix infinite home view <-> narrow loop on escape keypress. #30108
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Reproducer:
You will keep switching between narrow view and home view while you should just stop at home view. This was due to
set_hash_to_home_view
not considering empty hash as a valid home view hash.Introduced in f07ed8b
discussion: https://chat.zulip.org/#narrow/stream/9-issues/topic/Esc.20key.20loop.20with.20combined.20feed