feat: 显示问题

src/modules/exam/components/PreviewTaskPaper.vue

@@ -31,7 +31,10 @@
           <el-row>
             <el-col :span="12">
               <el-form-item label="卷型：">
-                <span>{{ rowData.paperType }}</span>
+                <span v-if="rowData.paperType">
+                  卷{{ rowData.paperType }}
+                </span>
+                <span v-else>--</span>
               </el-form-item>
             </el-col>
             <el-col :span="12">