ZP-762 Check if collection is synchronized before exporting changes in

Partial mode.

Released under the Affero GNU General Public License (AGPL) version 3.

src/lib/request/sync.php

@@ -572,12 +572,14 @@ class Sync extends RequestProcessor {
 
             // update a few values
             foreach($sc as $folderid => $spa) {
-                // manually set getchanges parameter for this collection
+                // manually set getchanges parameter for this collection if it is synchronized
+                if ($spa->HasSyncKey()) {
                     $sc->AddParameter($spa, "getchanges", true);
 
                     // announce WindowSize to DeviceManager
                     self::$deviceManager->SetWindowSize($folderid, $spa->GetWindowSize());
                 }
+            }
             if (!$sc->HasCollections())
                 $status = SYNC_STATUS_SYNCREQUESTINCOMPLETE;
         }