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.
}
          
          if (def.type === 'TypeParameter') {
            continue;
          }
          
          
          if (!dependencies.has(dependency)) {
            const resolved = reference.resolved;
            const isStable =
              memoizedIsStablecKnownHookValue(resolved) ||
              memoizedIsFunctionWithoutCapturedValues(resolved);
            dependencies.set(dependency, {
              isStable,
              references: [reference],
            });
          } else {
            dependencies.get(dependency).references.push(reference);
          }
        }
        for (const childScope of currentScope.childScopes) {
          gatherDependenciesRecursively(childScope);
        }
      }
      
      currentRefsInEffectCleanup.forEach(
        ({reference, dependencyNode}, dependency) => {
          const references = reference.resolved.references;