mgr/dashboard: fix roles page for roles without policies

If there is no permission policies attached to a role, it fails the
UI with an exception.

Fixes: https://tracker.ceph.com/issues/64588
Signed-off-by: Nizamudeen A <[email protected]>

Author: nizamial09

src/pybind/mgr/dashboard/frontend/src/app/shared/datatable/crud-table/crud-table.component.ts

@@ -147,7 +147,7 @@ export class CRUDTableComponent implements OnInit {
   setExpandedRow(event: any) {
     for (let i = 0; i < this.meta.detail_columns.length; i++) {
       let column = this.meta.detail_columns[i];
-      let columnDetail = event[column];
+      let columnDetail = event?.[column];
       this.expandedRow[column] = this.formatColumnDetails(columnDetail);
     }
   }

src/pybind/mgr/dashboard/services/rgw_client.py

@@ -843,6 +843,9 @@ def list_roles(self) -> List[Dict[str, Any]]:
             logger.warning('Error listing roles with code %d: %s', code, err)
             return []
 
+        for role in roles:
+            if 'PermissionPolicies' not in role:
+                role['PermissionPolicies'] = []
         return roles
 
     def create_role(self, role_name: str, role_path: str, role_assume_policy_doc: str) -> None: