fix:  query  find with no callback

lib/query.js

@@ -201,17 +201,19 @@ class ToshihikoQuery {
      * @returns {Promise} the promise object
      */
     find(callback, toJSON, options) {
-        if(typeof callback !== "function") {
-            options = toJSON;
-            toJSON = callback;
-            callback = emptyFunc;
-        }
-        if(typeof toJSON === "object") {
-            options = toJSON;
-            toJSON = false;
+        for(let i = 0; i < arguments.length; i++) {
+            switch(typeof arguments[i]) {
+                case "function": callback = arguments[i]; break;
+                case "boolean": toJSON = arguments[i]; break;
+                case "object": options = arguments[i]; break;
+                default: break;
+            }
         }
+
+        if(typeof callback !== "function") callback = emptyFunc;
+        if(typeof toJSON !== "boolean") toJSON = false;
+        if(typeof options !== "object") options = {};
         options = options || {};
-        if(undefined === callback) callback = emptyFunc;
 
         callback = common.promisify(callback);
         const self = this;