Merge pull request #144 in ZP/z-push from bugfix/ZP-831-combined-typo-in-variable-name to develop

* commit 'dd66bfdb':
  ZP-831 Combined - typo variable name. Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/combined/exporter.php

@@ -173,7 +173,7 @@ class ExportChangesCombined implements IExportChanges {
     public function InitializeExporter(&$importer) {
         ZLog::Write(LOGLEVEL_DEBUG, "ExportChangesCombined->InitializeExporter(...)");
         foreach ($this->exporters as $i => $e) {
-            if(!isset($this->_importwraps[$i])){
+            if(!isset($this->importwraps[$i])){
                 $this->importwraps[$i] = new ImportHierarchyChangesCombinedWrap($i, $this->backend, $importer);
             }
             $e->InitializeExporter($this->importwraps[$i]);