tools: fix eslint isRequired

Currently the call can lead to a TypeError with the message:
`Cannot read property 'value' of undefined`.

This fixes it by first checking that the first argument is truthy.

PR-URL: nodejs#18729
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

tools/eslint-rules/rules-utils.js

@@ -8,7 +8,7 @@
  * require calls.
  */
 module.exports.isRequired = function(node, modules) {
-  return node.callee.name === 'require' &&
+  return node.callee.name === 'require' && node.arguments.length !== 0 &&
     modules.includes(node.arguments[0].value);
 };