fix(wallet): rebase error

Author: notmandatory

crates/bdk/src/wallet/mod.rs

@@ -426,9 +426,6 @@ pub enum InsertTxError {
     },
 }
 
-#[cfg(feature = "std")]
-impl<P: core::fmt::Display + core::fmt::Debug> std::error::Error for NewError<P> {}
-
 impl<D> Wallet<D> {
     /// Initialize an empty [`Wallet`].
     pub fn new<E: IntoWalletDescriptor>(
@@ -1806,7 +1803,7 @@ impl<D> Wallet<D> {
         psbt: &mut psbt::PartiallySignedTransaction,
         sign_options: SignOptions,
     ) -> Result<bool, SignerError> {
-        let chain_tip = self.chain.tip().map(|cp| cp.block_id()).unwrap_or_default();
+        let chain_tip = self.chain.tip().block_id();
 
         let tx = &psbt.unsigned_tx;
         let mut finished = true;