refactor(model): remove unnecessary option fallback (#13825)

At that line variable "options" cannot be falsy.

lib/model.js

@@ -106,7 +106,7 @@ class Model {
     this._previousDataValues = {};
     this.uniqno = 1;
     this._changed = new Set();
-    this._options = options || {};
+    this._options = options;
 
     /**
      * Returns true if this instance has not yet been persisted to the database