Empty class breaks eslint for vue/no-restricted-class

[ibrahimBeladi]

When we have an empty class with no ="" in the deceleration, like in

<template>
    <span class>Hello</span>
</template>

with vue/no-restricted-class being warn or error, then it breaks the ESLint job/process

After running yarn eslint src/your-file.vue:

Oops! Something went wrong! :(

ESLint: 8.57.0

TypeError: Cannot read properties of null (reading 'value')
Occurred while linting path-to-file.vue:1
Rule: "vue/no-restricted-class"
    at VAttribute[directive=false][key.name="class"] (/project-path/node_modules/eslint-plugin-vue/lib/rules/no-restricted-class.js:136:44)
    at EventEmitter.emit (node:events:513:28)
    at NodeEventGenerator.applySelector (/project-path/node_modules/vue-eslint-parser/index.js:4373:26)
    at NodeEventGenerator.applySelectors (/project-path/node_modules/vue-eslint-parser/index.js:4387:22)
    at NodeEventGenerator.enterNode (/project-path/node_modules/vue-eslint-parser/index.js:4395:14)
    at traverse (/project-path/node_modules/vue-eslint-parser/index.js:165:13)
    at traverse (/project-path/node_modules/vue-eslint-parser/index.js:172:21)
    at traverse (/project-path/node_modules/vue-eslint-parser/index.js:177:13)
    at traverse (/project-path/node_modules/vue-eslint-parser/index.js:172:21)
    at traverseNodes (/project-path/node_modules/vue-eslint-parser/index.js:183:5)
error Command failed with exit code 2.

Checklist

• I have tried restarting my IDE and the issue persists.
• I have read the FAQ and my problem is not listed.

Tell us about your environment

• ESLint version: 8.57.0
• eslint-plugin-vue version: 9.22.0
• Vue version: 2.7.16
• Node version: v18.14.0 (with npm 9.3.1)
• Operating System: Linux Mint

Please show your full configuration:

module.exports = {
  extends: ['plugin:vue/recommended'],

  rules: {
    'vue/no-restricted-class': ['error', '/^(m|p)(l|r)-/']
  }
};

What did you do?

<template>
    <span class>Hello</span>
</template>

What did you expect to happen?
ESLint continues

What actually happened?
ESLint breaks

Repository to reproduce this issue