Fix total votes scope to remove redundant DB query

[gordanielyan]

If you try to get something like
Idea::withTotalVotes()->get()
the attribute total_votes can be null if there are no votes, which will result in additional query because of this fallback

laravel-vote/src/Traits/Votable.php

Line 77 in f06ad18

return (int) $this->attributes['total_votes'] ?? $this->totalVotes();

i suggest to use COALESCE to make it zero when no records are found