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.
for (const reference of currentScope.references) {
          
          
          if (!reference.resolved) {
            continue;
          }
          if (!pureScopes.has(reference.resolved.scope)) {
            continue;
          }
          
          
          const referenceNode = fastFindReferenceWithParent(
            node,
            reference.identifier,
          );
          const dependencyNode = getDependency(referenceNode);
          const dependency = analyzePropertyChain(
            dependencyNode,
            optionalChains,
          );
          
          if (