feat: consider whether exists context.parserServices.getDocumentFragment

Author: tyankatsu0105

Diff for: lib/rules/no-empty-component-block.js

@@ -47,6 +47,10 @@ module.exports = {
    * @returns {RuleListener} AST event handlers.
    */
   create(context) {
+    if (!context.parserServices.getDocumentFragment) {
+      return {}
+    }
+
     const componentBlocks = context.parserServices.getDocumentFragment()
       .children