Update SphinxSearch.php

If the getResultKeyByID returns a false, $result[$key] grabs the first item in the array which ends up returning the wrong result set.  This resolves that issue.
Merge branch 'master' of git://github.com/fierycode/sphinxsearch into fierycode-master

Conflicts:
	src/Scalia/SphinxSearch/SphinxSearch.php
Merge branch 'fierycode-master'