php 5.5.9 issue, count(false) returns true, making RolesList empty.

Author: cdujeu

core/src/core/src/pydio/Core/Services/RolesService.php

@@ -245,7 +245,7 @@ public static function getRolesList($roleIds = array(), $excludeReserved = false
         $searches = array_map(function($k){return "pydio:role:".$k;}, $roleIds);
         $fetches = CacheService::fetchMultiple(AJXP_CACHE_SERVICE_NS_SHARED, $searches);
         $missing = [];
-        if(count($fetches)){
+        if($fetches !== false && count($fetches)){
             $found = [];
             foreach($searches as $cacheKey){
                 $okKey = preg_replace('/^pydio:role:/', "", $cacheKey);