style: use unwrap or default (#4169)

crates/revm/revm-inspectors/src/tracing/builder/parity.rs

@@ -289,10 +289,7 @@ impl ParityTraceBuilder {
     ///
     /// does not have the code fields filled in
     pub fn vm_trace(&self) -> VmTrace {
-        match self.nodes.get(0) {
-            Some(current) => self.make_vm_trace(current),
-            None => VmTrace { code: Default::default(), ops: Vec::new() },
-        }
+        self.nodes.first().map(|node| self.make_vm_trace(node)).unwrap_or_default()
     }
 
     /// Returns a VM trace without the code filled in

crates/rpc/rpc-types/src/eth/trace/parity.rs

@@ -279,7 +279,7 @@ pub struct LocalizedTransactionTrace {
 }
 
 /// A record of a full VM trace for a CALL/CREATE.
-#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Clone, Debug, Default, Eq, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct VmTrace {
     /// The code to be executed.