fix: type error in workflow (#25847) (#25848)

if state is null, we can't get roles for it.

(cherry picked from commit da682ae)

Co-authored-by: Ankush Menat <ankush@frappe.io>

frappe/public/js/frappe/model/workflow.js

@@ -60,10 +60,9 @@ frappe.workflow = {
 
 			var state =
 				doc[state_fieldname] || frappe.workflow.get_default_state(doctype, doc.docstatus);
+			if (!state) return false;
 
-			let allow_edit_roles = state
-				? frappe.workflow.get_document_state_roles(doctype, state)
-				: null;
+			let allow_edit_roles = frappe.workflow.get_document_state_roles(doctype, state);
 			let has_common_role = frappe.user_roles.some((role) =>
 				allow_edit_roles.includes(role)
 			);