refactor: Billing refactor

substrate-node/pallets/pallet-smart-contract/src/billing.rs

@@ -175,7 +175,11 @@ impl<T: Config> Pallet<T> {
                 (None, None)
             };
 
-        let mut contract_payment_state = ContractPaymentState::<T>::get(contract.contract_id).unwrap();
+        let mut contract_payment_state = ContractPaymentState::<T>::get(contract.contract_id).ok_or_else(|| {
+            log::error!("Contract payment state not exists for contract_id {}", contract_id);
+            Error::<T>::ContractPaymentStateNotExists
+        })?;
+
         log::trace!(
             "Contract payment state [before billing]: {:?}",
             contract_payment_state

substrate-node/pallets/pallet-smart-contract/src/grid_contract.rs

@@ -745,7 +745,10 @@ impl<T: Config> ChangeNode<LocationOf<T>, InterfaceOf<T>, SerialNumberOf<T>> for
         let node_power = pallet_tfgrid::NodePower::<T>::get(node.id);
         if !node_power.is_standby() {
             if let Some(rc_id) = ActiveRentContractForNode::<T>::get(node.id) {
-                let mut contract_payment_state = ContractPaymentState::<T>::get(rc_id).unwrap();
+                let Some(mut contract_payment_state) = ContractPaymentState::<T>::get(rc_id) else {
+                    log::warn!("Contract payment state not exists for contract_id {}", rc_id);
+                    return;
+                };
                 let now = Self::get_current_timestamp_in_secs();
                 contract_payment_state.last_updated_seconds = now;
                 ContractPaymentState::<T>::insert(rc_id, &contract_payment_state);

substrate-node/pallets/pallet-smart-contract/src/lib.rs

@@ -417,6 +417,7 @@ pub mod pallet {
         UnauthorizedToChangeSolutionProviderId,
         UnauthorizedToSetExtraFee,
         RewardDistributionError,
+        ContractPaymentStateNotExists,
     }
 
     #[pallet::genesis_config]