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.
}, [prop]);
        }
      `,
    },
  ],
  invalid: [
    {
      code: normalizeIndent`
      function Foo() {
        const foo = ({}: any);
        useMemo(() => {
          console.log(foo);
        }, [foo]);
      }
    `,
      errors: [
        {
          message:
            "The 'foo' object makes the dependencies of useMemo Hook (at line 6) change on every render. " +
            "Move it inside the useMemo callback. Alternatively, wrap the initialization of 'foo' in its own useMemo() Hook.",
          suggestions: undefined,
        },
      ],
    },
  ],
};
const testsTypescript = {
  valid: [
    {