自动隐藏没有答案的情况

src/pages/Memory/index.tsx

@@ -246,11 +246,17 @@ const TableList: React.FC<{}> = () => {
           <p/>
           {state.showBack ? (
             <div>
-              反面：
-              <p/>
-              <Quill theme="bubble" readonly onChange={() => {
-              }} value={memory.back}/>
-              <p/>
+              {
+                memory.back.length > 0 ? (
+                  <div>
+                    反面：
+                    <p/>
+                    <Quill theme="bubble" readonly onChange={() => {
+                    }} value={memory.back}/>
+                    <p/>
+                  </div>
+                ) : null}
+
               <div className={styles.divBottom}>
                 <Button
                   type="primary"