fix(valid-template-root): add test no option

Author: perrysong

tests/lib/rules/valid-template-root.js

@@ -99,6 +99,10 @@ tester.run('valid-template-root', rule, {
       filename: 'test.vue',
       code: '<template><template></template></template>'
     },
+    {
+      filename: 'test.vue',
+      code: '<template> <div v-if="mode === \'a\'"></div><div v-if="mode === \'b\'"></div></template>'
+    },
     {
       filename: 'test.vue',
       options: [{ ignoreOnlyIfDirective: false }],