Remove unused collectionCheck function from switch.php

Changelog

@@ -1,4 +1,5 @@
 2018-07-16 DariusIII
+	* CHg: Remove unused collectionCheck function from switch.php
 	* Chg: Update various scripts in misc folder
 	* Chg: Update sphinx tables creation scripts
 	* Chg: Update used libraries to latest versions

misc/update/multiprocessing/.do_not_run/switch.php

@@ -428,22 +428,6 @@ function charCheck($char)
 	return false;
 }
 
-/**
- * Check if the group should be processed.
- *
- * @param int                $groupID
- */
-function collectionCheck($groupID)
-{
-	try {
-		if (DB::select(sprintf('SELECT id FROM collections_%d LIMIT 1', $groupID)) === 0) {
-			exit();
-		}
-	} catch (PDOException $e) {
-		$e->getMessage();
-	}
-}
-
 /**
  * Connect to usenet, return NNTP object.
  *