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84c2f003b3
When a large cluster of unconfirmed transactions exceeds the limit,
calculateCombinedBumpFee() returns std::nullopt.
Previously, we continued executing and the optional value was
accessed unconditionally, leading to a std::bad_optional_access
exception.
Fix this by returning early when the returned bumped fee is null.
Note:
This is a crash for the GUI, and an uncaught exception for the RPC
bumpfee and psbtbumpfee.
Github-Pull: #34870
Rebased-From: 6072a2a6a1