fix: 添加选项数据的防御性检查

- 在ExamOnline和ExamPrint中对question.options添加空值检查
- 使用 (question.options || []) 防止 undefined 错误
- 确保在选项数据缺失时不会导致页面崩溃

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/pages/ExamOnline.tsx

@@ -288,7 +288,7 @@ const ExamOnline: React.FC = () => {
         >
           <Radio.Group>
             <Space direction="vertical">
-              {question.options.map((opt) => (
+              {(question.options || []).map((opt) => (
                 <Radio key={opt.key} value={opt.key}>
                   {opt.key}. {opt.value}
                 </Radio>
@@ -315,7 +315,7 @@ const ExamOnline: React.FC = () => {
         >
           <Checkbox.Group>
             <Space direction="vertical">
-              {question.options.map((opt) => (
+              {(question.options || []).map((opt) => (
                 <Checkbox key={opt.key} value={opt.key}>
                   {opt.key}. {opt.value}
                 </Checkbox>

web/src/pages/ExamPrint.tsx

@@ -210,7 +210,7 @@ const ExamPrint: React.FC = () => {
           </Text>
         </div>
         <div className={styles.optionsList}>
-          {question.options.map((opt) => (
+          {(question.options || []).map((opt) => (
             <div key={opt.key} className={styles.optionItem}>
               {opt.key}. {opt.value}
             </div>
@@ -237,7 +237,7 @@ const ExamPrint: React.FC = () => {
           </Text>
         </div>
         <div className={styles.optionsList}>
-          {question.options.map((opt) => (
+          {(question.options || []).map((opt) => (
             <div key={opt.key} className={styles.optionItem}>
               {opt.key}. {opt.value}
             </div>