Fix issue with getTarget('/')

Author: pseudomuto

lib/store/redis.js

@@ -43,7 +43,9 @@ function getKeyPaths (path) {
 
   while (parts.length) {
     key = parts.pop();
-    keys.push(parts.join("/") + "/" + key);
+    if (key) {
+      keys.push(parts.join("/") + "/" + key);
+    }
   }
 
   return keys.concat("/");