fix: signer fills from if unset (alloy-rs#555)

crates/provider/src/fillers/nonce.rs

@@ -122,8 +122,7 @@ mod tests {
 
     #[tokio::test]
     async fn no_nonce_if_sender_unset() {
-        let (provider, _anvil) =
-            ProviderBuilder::new().with_nonce_management().on_anvil_with_signer();
+        let (provider, _anvil) = ProviderBuilder::new().with_nonce_management().on_anvil();
 
         let tx = TransactionRequest {
             value: Some(U256::from(100)),

crates/provider/src/fillers/signer.rs

@@ -46,6 +46,10 @@ where
     type Fillable = ();
 
     fn status(&self, tx: &<N as Network>::TransactionRequest) -> FillerControlFlow {
+        if tx.from().is_none() {
+            return FillerControlFlow::Ready;
+        }
+
         if tx.can_build() {
             FillerControlFlow::Ready
         } else {
@@ -72,11 +76,18 @@ where
         _fillable: Self::Fillable,
         tx: SendableTx<N>,
     ) -> TransportResult<SendableTx<N>> {
-        let builder = match tx {
+        let mut builder = match tx {
             SendableTx::Builder(builder) => builder,
             _ => return Ok(tx),
         };
 
+        if builder.from().is_none() {
+            builder.set_from(self.signer.default_signer());
+            if !builder.can_build() {
+                return Ok(SendableTx::Builder(builder));
+            }
+        }
+
         let envelope = builder.build(&self.signer).await.map_err(RpcError::local_usage)?;
 
         Ok(SendableTx::Envelope(envelope))