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.
`Either include it or remove the dependency array. ` +
            `If 'fetchPodcasts' changes too often, ` +
            `find the parent component that defines it and wrap that definition in useCallback.`,
          suggestions: [
            {
              desc: 'Update the dependencies array to be: [fetchPodcasts, id]',
              output: normalizeIndent`
                function Podcasts({ fetchPodcasts, id }) {
                  let [podcasts, setPodcasts] = useState(null);
                  useEffect(() => {
                    console.log(fetchPodcasts);
                    fetchPodcasts(id).then(setPodcasts);
                  }, [fetchPodcasts, id]);
                }
              `,
            },
          ],
        },
      ],
    },
    {
      code: normalizeIndent`
        function Podcasts({ fetchPodcasts, id }) {
          let [podcasts, setPodcasts] = useState(null);
          useEffect(() => {
            console.log(fetchPodcasts);
            fetchPodcasts?.(id).then(setPodcasts);
          }, [id]);
        }
      `,