Update Model save() to return true on non-error (#15236)

src/Illuminate/Database/Eloquent/Model.php

@@ -1462,7 +1462,7 @@ public function save(array $options = [])
         // clause to only update this model. Otherwise, we'll just insert them.
         if ($this->exists) {
             $saved = $this->isDirty() ?
-                        $this->performUpdate($query) : false;
+                        $this->performUpdate($query) : true;
         }
 
         // If the model is brand new, we'll insert it into our database and set the