Merge pull request #177 in ZP/z-push from...

Merge pull request #177 in ZP/z-push from bugfix/ZP-842-outlook-via-as-does-not-synchronize to develop

* commit '2b5c898e':
  ZP-842 Check if a folders parent ID is known on the mobile. If not, the folder is ignored and not synchronized to the device.

(cherry picked from commit ff984d6f)

src/lib/core/changesmemorywrapper.php

@@ -228,6 +228,12 @@ class ChangesMemoryWrapper extends HierarchyCache implements IImportChanges, IEx
                     return false;
                 }
 
+                // check if the parent ID is known on the device
+                if (!isset($folder->parentid) || $folder->parentid != "0" &&  !$this->GetFolder($folder->parentid)) {
+                    ZLog::Write(LOGLEVEL_DEBUG, sprintf("ChangesMemoryWrapper->ImportFolderChange(): Change for folder '%s' will not be sent as parent folder is not set or not known on mobile.", $folder->displayname));
+                    return false;
+                }
+
                 // load this change into memory
                 $this->changes[] = array(self::CHANGE, $folder);