try to restore original code

Author: dkuku

native/explorer/src/series/from_list.rs

@@ -240,17 +240,14 @@ pub fn s_from_list_decimal(
                     })
             }
 
-            TermType::Map => {
-                let ex_decimal = item
-                    .decode::<ExDecimal>()
-                    .map_err(|error| {
-                        ExplorerError::Other(format!(
-                            "cannot decode a valid decimal from term; check that `coef` fits into an `i128`. error: {error:?}"
-                        ))
-                    })?;
-                let coef = ex_decimal.signed_coef()?;
-                Ok(AnyValue::Decimal(coef, ex_decimal.scale()))
-            },
+            TermType::Map => item
+                .decode::<ExDecimal>()
+                .map_err(|err| {
+                    ExplorerError::Other(format!(
+                        "cannot decode a valid decimal from term; check that `coef` fits into an `i128`. error: {err:?}"
+                    ))
+                })
+                .and_then(|ex_decimal| Ok(AnyValue::Decimal(ex_decimal.signed_coef()?, ex_decimal.scale()))),
 
             TermType::Atom => Ok(AnyValue::Null),