fix(solc): use empty bytecode as default instead unlinked (#1743)

* fix(solc): use empty bytecode as default instead unlinked

* chore: fmt

Co-authored-by: Georgios Konstantopoulos <me@gakonst.com>

ethers-solc/src/artifacts/bytecode.rs

@@ -352,10 +352,10 @@ impl BytecodeObject {
     }
 }
 
-// Returns a not deployable bytecode by default as empty
+// Returns an empty bytecode object
 impl Default for BytecodeObject {
     fn default() -> Self {
-        BytecodeObject::Unlinked("".to_string())
+        BytecodeObject::Bytecode(Default::default())
     }
 }
 
@@ -457,3 +457,31 @@ impl From<CompactDeployedBytecode> for DeployedBytecode {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{artifacts::ContractBytecode, ConfigurableContractArtifact};
+
+    #[test]
+    fn test_empty_bytecode() {
+        let empty = r#"
+        {
+  "abi": [],
+  "bytecode": {
+    "object": "0x",
+    "linkReferences": {}
+  },
+  "deployedBytecode": {
+    "object": "0x",
+    "linkReferences": {}
+  }
+  }
+        "#;
+
+        let artifact: ConfigurableContractArtifact = serde_json::from_str(empty).unwrap();
+        let contract = artifact.into_contract_bytecode();
+        let bytecode: ContractBytecode = contract.into();
+        let bytecode = bytecode.unwrap();
+        assert!(!bytecode.bytecode.object.is_unlinked());
+    }
+}