fix(compiler-sfc): lang="" on a html tag produces error

Author: edison1105

packages/compiler-sfc/__tests__/parse.spec.ts

@@ -150,7 +150,13 @@ h1 { color: red }
   })
 
   test('should parse as DOM by default', () => {
-    const { errors } = parse(`<template><input></template>`)
+    const { errors } = parse(`
+    <template>
+      <div lang="">
+        <div></div>
+      </div>
+    </template>
+    `)
     expect(errors.length).toBe(0)
   })
 

packages/compiler-sfc/src/parse.ts

@@ -112,13 +112,14 @@ export function parse(
       if (
         (!parent && tag !== 'template') ||
         // <template lang="xxx"> should also be treated as raw text
-        props.some(
-          p =>
-            p.type === NodeTypes.ATTRIBUTE &&
-            p.name === 'lang' &&
-            p.value &&
-            p.value.content !== 'html'
-        )
+        (tag === 'template' &&
+          props.some(
+            p =>
+              p.type === NodeTypes.ATTRIBUTE &&
+              p.name === 'lang' &&
+              p.value &&
+              p.value.content !== 'html'
+          ))
       ) {
         return TextModes.RAWTEXT
       } else {