Fixed front ann book and delete err handling

Button no longer pre-updates on err
File uploading fix

front/src/hooks/api/useAddAnnouncement.ts

@@ -14,8 +14,8 @@ function useAddAnnouncement() {
         processPutAnnouncement
     )
 
-    function handleAdd(formData: FormData) {
-        void doSend({}, {
+    async function handleAdd(formData: FormData) {
+        await doSend({}, {
             body: formData,
         })
     }

front/src/hooks/api/useBook.ts

@@ -15,8 +15,8 @@ function useBook() {
         processBook,
     )
 
-    const handleBook = useCallback((id: number) => {
-        void doSend({}, {
+    const handleBook = useCallback(async (id: number) => {
+        await doSend({}, {
             body: JSON.stringify({
                 id,
             }),

front/src/hooks/useSendButtonCaption.ts

@@ -12,7 +12,7 @@ function useSendButtonCaption(
     const [title, setTitle] = useState(initial)
 
     const update = useCallback(<T extends NonNullable<unknown>>(data: T | null | undefined) => {
-        if (data !== undefined) { // not loading
+        if (data !== undefined && data !== null) { // not loading or error
             setCaption(result)
             setTitle('Отправить ещё раз')