Hotfix: Wrong number of parameters for del command.

`$this->journal->clean(...)` can produce empty array which causes an error when calling Redis del command.

Author: sasule

src/Caching/RedisStorage.php

@@ -199,7 +199,7 @@ public function clean(array $conditions): void
 		// cleaning using journal
 		if ($this->journal !== null) {
 			$keys = $this->journal->clean($conditions);
-			if ($keys !== null) {
+			if ($keys !== null && $keys !== []) {
 				$this->client->del($keys);
 			}
 		}