never return an empty array

NetBiblio.php

@@ -267,7 +267,7 @@ class NetBiblio extends WebService
                         CheckOutDate=GETDATE()
                     WHERE circulationID = $id";
             Connection::execute($sql);
-            return true;
+            return array('success' => true);
         }
 
         $sql = "SELECT TOP 1 circulationID FROM OldCirculations ORDER BY CirculationID DESC";
@@ -307,7 +307,7 @@ class NetBiblio extends WebService
                     0, 0, 1, '-', 1, 1
                 );";
         Connection::execute($sql);
-        return true;
+        return array('success' => true);
     }
 
     public function Authenticate($login, $password, $client = "website")
@@ -340,7 +340,7 @@ class NetBiblio extends WebService
                 $params["secure"], $params["httponly"]);
         }
 
-        return array();
+        return array('success' => true);
     }
 
     public function IsAuthenticated()