add server error result

src/client/Components/Result.jsx

@@ -4,3 +4,7 @@ import { Result, Button } from 'antd';
 export const NotFound = () => (
   <Result status="404" title="404" subTitle="Ой! Тут ничего нет." />
 );
+
+export const ServerError = () => (
+  <Result status="500" title="500" subTitle={'Ой! Что-то сломалось.'} />
+);

src/client/Containers/Calculation/index.jsx

@@ -1,4 +1,5 @@
 import { Spin } from 'antd';
+import { ServerError } from 'client/Components/Result';
 import Modal from 'client/Elements/Modal';
 import { withStoreModal } from 'client/hocs/withStore';
 import { useStores } from 'client/hooks/useStores';
@@ -11,6 +12,7 @@ import Sections from './Sections';
 
 const Calculation = () => {
   const [ready, setReady] = useState(false);
+  const [error, setError] = useState(undefined);
   const { calculationStore } = useStores();
   useEffect(() => {
     Promise.all([
@@ -29,11 +31,12 @@ const Calculation = () => {
         setReady(true);
       })
       .catch(err => {
+        setError(err);
         throw err;
       });
   }, []);
 
-  if (!ready) {
+  if (!error && !ready) {
     return (
       <Box height="100%" py="10px">
         <Flex justifyContent="center" alignItems="center">
@@ -43,6 +46,10 @@ const Calculation = () => {
     );
   }
 
+  if (error) {
+    return <ServerError />;
+  }
+
   const ModalComponent = withStoreModal(Modal);
 
   return (