Small PR changes

Author: stevebauman

src/Auth/DatabaseUserProvider.php

@@ -135,24 +135,21 @@ public function validateCredentials(Authenticatable $model, array $credentials)
                 // validation rules pass, we will allow the authentication
                 // attempt. Otherwise, it is automatically rejected.
                 if ($this->newValidator($this->getRules($this->user, $model))->passes()) {
+                    $password = null;
+                    
                     // We'll check if we've been given a password and that
                     // syncing password is enabled. Otherwise we'll
                     // use a random 16 character string.
-
-                    $password = null;
                     if ($this->isSyncingPasswords()) {
                         $password = $credentials['password'];
-                    } else {
-                        if(null === $model->password || empty($model->password)) {
-                            // password unset
-                            $password = str_random();
-                        }
+                    } else if (is_null($model->password) || empty($model->password)) {
+                        $password = str_random();
                     }
 
                     // If the model has a set mutator for the password then we'll
                     // assume that we're using a custom encryption method for
                     // passwords. Otherwise we'll bcrypt it normally.
-                    if(null !== $password) {
+                    if(! is_null($password)) {
                         $model->password = $model->hasSetMutator('password') ?
                             $password : bcrypt($password);
                     }