Changes sizeof check to throw an error if no zone id is found.

src/Endpoints/Zones.php

@@ -96,7 +96,7 @@ class Zones implements API
     {
         $zones = $this->listZones($name);
 
-        if (sizeof($zones) < 1) {
+        if (sizeof($zones->result) < 1) {
             throw new EndpointException("Could not find zones with specified name.");
         }
 
@@ -142,4 +142,4 @@ class Zones implements API
 
         return false;
     }
-}
+}