fix create update Provider

- set default value agent to null

src/pages/master/provider/blocks/EditDialog.tsx

@@ -58,7 +58,7 @@ const EditDialog = () => {
     type: string;
     status: string;
     transaction_type: string;
-    agent: string;
+    agent: string | null;
     updated_by: string;
     updated_at: string;
   } = {
@@ -67,7 +67,7 @@ const EditDialog = () => {
     type: '',
     status: '',
     transaction_type: '',
-    agent: '',
+    agent: null,
     updated_by: '',
     updated_at: ''
   };
@@ -169,8 +169,7 @@ const EditDialog = () => {
       formField.description.trim() === '' ||
       formField.type.trim() === '' ||
       formField.status.trim() === '' ||
-      formField.transaction_type.trim() === '' ||
-      formField.agent.trim() === ''
+      formField.transaction_type.trim() === ''
     ) {
       setAlert({ show: true, message: 'Please fill in all required fields.' });
       return;