eslint-plugin-react-hooks version: 4.2.0

## Steps To Reproduce

I know it shouldn't exist in production code, but it's annoying while editing some files.

```js
import React, { useEffect } from "react";

const App = () => {
  useEffect(); // <-
  return null;
};

export default App;
```

Link to code example: https://codesandbox.io/s/polished-sun-3wr27?file=/src/App.js

## The current behavior

ESLint crashed.

```
TypeError: Cannot read property 'type' of undefined
```

## The expected behavior

ESLint doesn't crash but reports an error instead.
`,
      errors: [
        {
          message:
            "React Hook React.useEffect has a missing dependency: 'Component'. " +
            'Either include it or remove the dependency array.',
          suggestions: [
            {
              desc: 'Update the dependencies array to be: [Component]',
              output: normalizeIndent`
              function Foo({ Component }) {
                React.useEffect(() => {
                  console.log(<Component />);
                }, [Component]);
              };
            `,
            },
          ],
        },
      ],
    },
  ],
};
if (!process.env.CI) {
  let only = [];
  let skipped = [];
  [
    ...tests.valid,
    ...tests.invalid,
    ...testsFlow.valid,