SearchApiFacetapiAdapter::getCurrentSearch() returns NULL if called before calling search_api_current_search() without a query

The title may look somehow confusing so I try to explain this :)

getCurrentSearch() in SearchApiFacetapiAdapter relies on search_api_current_search() executed before with a SearchApiQuery as parameter.
If (for whatever reasons) getCurrentSearch() is called before search_api_current_search() has been called with a full query, it will always return NULL and you don't have a change to get the current search.

I know this is a rather edge case but I stumbled upon this creating breadcrumbs using facet links (with module Hansel).

Example:

<?php
// this will return NULL since there is no active search
$search = $adapter->getCurrentSearch();
// i.e search_api_views block
search_api_current_search($query->getOption('search id'), $query, $cache->data['search_api results']);
// the static $searches array is now filled ...
// but this call will return NULL again
$search = $adapter->getCurrentSearch();
?>

Simple patch follows.