Set empty relations as loaded too and prevent unnecessary database queries. #116
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When accessing a relation via the magic __get method on Elasticquent loaded model, unnecessary queries to the datatabase are performed if the relation is empty,. For example:
If the properties related model (BelongsToMany relationship) is an empty array on ElasticSearch document the relation on the $product model isn't loaded and a query to the database is performed. With this fix we prevent this unnecessary queries.