no-unused-components crashes on dynamic components

[armano2]

Tell us about your environment

• ESLint version: 5.9.0
• eslint-plugin-vue version: ^5.0.0
• Node version: 8.12.0

What did you do?

<template>
<component :is=""></component>
</template>

What did you expect to happen?
eslint should not crash

What actually happened?

TypeError: Cannot read property 'type' of null
    at EventEmitter.VAttribute[directive=true][key.name='bind'][key.argument='is']

node.value.expression may be null/undefined

[armano2]

solution:

https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/no-unused-components.js#L59

- if (node.value.type !== 'VExpressionContainer') return
+ if (node.value.type !== 'VExpressionContainer' || !node.value.expression) return