ZP-1196 Catch warnings when no GAB data can be retrieved from the

server.

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

tools/gab-sync/lib/kopano.php

@@ -345,6 +345,10 @@ class Kopano extends SyncWorker {
                                                             PR_EC_AB_HIDDEN,
                                                             PR_DISPLAY_TYPE_EX
                                                     ));
+        if(!is_array($gabentries)) {
+            $this->Log("Kopano->GetGAB(): GAB data can not be retrieved.");
+            return $data;
+        }
         foreach ($gabentries as $entry) {
             // do not add SYSTEM user to the GAB
             if (strtoupper($entry[PR_DISPLAY_NAME]) == "SYSTEM") {

tools/gab-sync/lib/syncworker.php

@@ -128,6 +128,10 @@ abstract class SyncWorker {
             $chunks[$id][$key] = $entry;
         }
 
+        if (empty($chunks)) {
+            $this->Log("No data available");
+            return;
+        }
         $entries = 0;
         $minEntries = $minSize = 99999999999;
         $maxEntries = $maxSize = 0;