Merge pull request #475 in ZP/z-push from...

Merge pull request #475 in ZP/z-push from bugfix/ZP-1160-warnings-in-mr-sync-when-user-not to develop

* commit '4015a071':
  ZP-1160 Check if the Representing_ENTRY_ID is set in the properties before accessing it.

src/backend/kopano/mapiprovider.php

@@ -265,7 +265,7 @@ class MAPIProvider {
 
             //set attendee's status and type if they're available and if we are the organizer
             $storeprops = $this->GetStoreProps();
-            if (isset($row[PR_RECIPIENT_TRACKSTATUS]) && $messageprops[$appointmentprops["representingentryid"]] == $storeprops[PR_MAILBOX_OWNER_ENTRYID])
+            if (isset($row[PR_RECIPIENT_TRACKSTATUS]) && isset($messageprops[$appointmentprops["representingentryid"]]) && $messageprops[$appointmentprops["representingentryid"]] == $storeprops[PR_MAILBOX_OWNER_ENTRYID])
                 $attendee->attendeestatus = $row[PR_RECIPIENT_TRACKSTATUS];
             if (isset($row[PR_RECIPIENT_TYPE]))
                 $attendee->attendeetype = $row[PR_RECIPIENT_TYPE];