fix(framework): make clear fields gas optional

Author: jolestar

frameworks/moveos-stdlib/src/natives/moveos_stdlib/object/object_fn.rs

@@ -239,13 +239,13 @@ pub(crate) fn native_to_frozen_object(
 
 #[derive(Debug, Clone)]
 pub struct ClearFieldsGasParameters {
-    pub base: InternalGas,
+    pub base: Option<InternalGas>,
 }
 
 impl ClearFieldsGasParameters {
     pub fn zeros() -> Self {
         Self {
-            base: InternalGas::zero(),
+            base: Some(InternalGas::zero()),
         }
     }
 }
@@ -266,7 +266,9 @@ pub(crate) fn native_clear_fields(
     let obj_id = pop_object_id(&mut args)?;
     object_fn_dispatch(
         &common_gas_parameter,
-        clear_fields_gas_parameter.base,
+        clear_fields_gas_parameter
+            .base
+            .unwrap_or_else(InternalGas::zero),
         context,
         obj_id,
         &ty_args[0],

frameworks/rooch-framework/src/natives/gas_parameter/object.rs

@@ -16,7 +16,7 @@ crate::natives::gas_parameter::native::define_gas_parameters_for_natives!(GasPar
     [.native_transfer_object.base, "native_transfer_object.base", 500 * MUL],
     [.native_to_shared_object.base, "native_to_shared_object.base", 500 * MUL],
     [.native_to_frozen_object.base, "native_to_frozen_object.base", 500 * MUL],
-    [.native_clear_fields.base, "native_clear_fields.base", 500 * MUL],
+    [.native_clear_fields.base, optional "native_clear_fields.base", 500 * MUL],
 
     [.native_add_field.base, "native_add_field.base", 500 * MUL],
     [.native_add_field.per_byte_serialized, "native_add_field.per_byte_serialized", 10 * MUL],