fix: fix bug if cannt get file then will throw error

client/web/src/components/AvatarPicker.tsx

@@ -30,6 +30,9 @@ export const AvatarPicker: React.FC<AvatarPickerProps> = React.memo((props) => {
   const handleSelectFile = (e: React.ChangeEvent<HTMLInputElement>) => {
     if (e.target.files && e.target.files.length > 0) {
       const pickedFile = e.target.files[0];
+      if (!pickedFile) {
+        return;
+      }
 
       if (isGIF(pickedFile)) {
         updateAvatar(URL.createObjectURL(pickedFile));

client/web/src/components/ChatBox/ChatInputBox/ChatDropArea.tsx

@@ -12,6 +12,10 @@ export const ChatDropArea: React.FC = React.memo(() => {
 
   const handleDrop = useMemoizedFn((files: File[]) => {
     const file = files[0];
+    if (!file) {
+      return;
+    }
+
     if (file.type.startsWith('image/')) {
       // 发送图片
       uploadMessageImage(file).then(({ url, width, height }) => {