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37e0a5ae8d
If no "fish_right_prompt" is defined, then we also don't need to
define and save an empty one. We can do nothing, which seems cleaner.
It's also what "fish_config prompt choose" does. Git blame shows no
explicit reason for for this inconsistency.
Probably the implicit reason is that when both styles where introduced
(both in 69074c1591 (fish_config: Remove right prompt in `choose` and
`save`, 2021-09-26)), that was before the "fish_config prompt choose:
make right prompt hack less weird" commit, so the "prompt choose"
code path didn't know whether the prompt existed until after checking,
hence "--erase" was more suitable.. but that inconsistency is gone.