fix(hast-util-to-jsx.js): files with one element thowes error

change the check to test that ther is more that 1 element, to more that 0 elements.

input/3.development.md

@@ -0,0 +1,5 @@
+---
+title: react development env
+---
+
+# react development env

lib/hastUtilToJsx.js

@@ -273,7 +273,7 @@ function renderNode(ctx, node, index, parent) {
   }
 
   // if it goes in to this if, its because its the last run. And element.allNotes is every elements in one string
-  if (type === "root" && node.children.length > 1) {
+  if (type === "root" && node.children.length > 0) {
     let wrapperName = ctx.wrapper === "fragment" ? "React.Fragment" : "div";
 
     // if the wrapper for body is set, the its gonna overwrite the wrapperName

output/1.testmarkdown.js

@@ -15,7 +15,7 @@ const frontMatter = {
   quantity: 834
 };
 
-export default class Testmarkdown extends React.PureComponent {
+export default class Print extends React.PureComponent {
   render() {
     const props = this.props;
     return (

output/3.development.js

@@ -0,0 +1,20 @@
+/*---
+react development env
+---*/
+import React from 'react';
+import headline from 'semantic-ui-react/headline';
+
+const frontMatter = {
+  title: 'react development env'
+};
+
+export default class Print extends React.PureComponent {
+  render() {
+    const props = this.props;
+    return (
+      <div>
+        <headline>react development env</headline>
+      </div>
+    );
+  }
+}