Always return an array from find

web/includes/Server.php

@@ -98,7 +98,7 @@ class Server {
           $file = $backTrace[1]['file'];
           $line = $backTrace[1]['line'];
           Error("Invalid value for limit($limit) passed to Server::find from $file:$line");
-          return;
+          return array();
         }
       }
     }
@@ -106,6 +106,7 @@ class Server {
     if ( $results ) {
       return array_map( function($id){ return new Server($id); }, $results );
     }
+    return array();
   }
 
   public static function find_one( $parameters = array() ) {