Update query.js

Author: vkarpov15

lib/query.js

@@ -168,7 +168,7 @@ function Query(conditions, options, model, collection) {
 // Helper function to check if an object is empty or contains only empty objects/arrays
 function isEmptyFilter(obj) {
   if (obj == null) return true;
-  if (typeof obj !== 'object' || obj === null) return false;
+  if (typeof obj !== 'object') return true;
   if (Object.keys(obj).length === 0) return true;
 
   // Check $and, $or, $nor arrays