fix cancel error on empty new

src/user-federation/ldap/mappers/LdapMapperDetails.tsx

@@ -374,8 +374,12 @@ export const LdapMapperDetails = () => {
             <Button
               variant="link"
               onClick={() =>
-                history.push(
+                isNew
-                  `/${realm}/user-federation/ldap/${mapping!.parentId}/mappers`
+                  ? history.goBack()
+                  : history.push(
+                      `/${realm}/user-federation/ldap/${
+                        mapping!.parentId
+                      }/mappers`
                     )
               }
               data-testid="ldap-cancel"