`wallet.make_unsigned_transaction` can raise NotEnoughFunds or NoDynamicFeeEstimates.
These are "expected" exceptions that need to be handled or worked around. Added a note
of this in the docstring now.
We now handle NoDynamicFeeEstimates by allowing a static fallback fee in
`wallet.can_pay_onchain` and `lnworker.suggest_funding_amount`. It should be
fine to have a static fallback in these cases, as the user still has a chance
to set their own fee later in the flow.
(though ofc the static fallback might be too high in some mempool conditions,
in which case e.g. can_pay_onchain might return a false-negative, but this
is still an improvement over raising I believe)
fixes https://github.com/spesmilo/electrum/issues/5784
42f2a3da31