Merge pull request #311 in ZP/z-push from...

Merge pull request #311 in ZP/z-push from bugfix/ZP-995-warnings-in-webserviceinfo--listuserfolders to develop

* commit '802f46eb':
  ZP-995 Warnings in WebserviceInfo->ListUserFolders().

src/backend/kopano/mapiprovider.php

@@ -921,16 +921,20 @@ class MAPIProvider {
         $storeprops = $this->getStoreProps();
         $inboxprops = $this->getInboxProps();
 
-        if($entryid == $inboxprops[PR_ENTRYID])
-            return SYNC_FOLDER_TYPE_INBOX;
-        if($entryid == $inboxprops[PR_IPM_DRAFTS_ENTRYID])
-            return SYNC_FOLDER_TYPE_DRAFTS;
         if($entryid == $storeprops[PR_IPM_WASTEBASKET_ENTRYID])
             return SYNC_FOLDER_TYPE_WASTEBASKET;
         if($entryid == $storeprops[PR_IPM_SENTMAIL_ENTRYID])
             return SYNC_FOLDER_TYPE_SENTMAIL;
         if($entryid == $storeprops[PR_IPM_OUTBOX_ENTRYID])
             return SYNC_FOLDER_TYPE_OUTBOX;
+
+        // Public folders do not have inboxprops
+        // @see https://jira.z-hub.io/browse/ZP-995
+        if (!empty($inboxprops)) {
+            if($entryid == $inboxprops[PR_ENTRYID])
+                return SYNC_FOLDER_TYPE_INBOX;
+            if($entryid == $inboxprops[PR_IPM_DRAFTS_ENTRYID])
+                return SYNC_FOLDER_TYPE_DRAFTS;
             if($entryid == $inboxprops[PR_IPM_TASK_ENTRYID])
                 return SYNC_FOLDER_TYPE_TASK;
             if($entryid == $inboxprops[PR_IPM_APPOINTMENT_ENTRYID])
@@ -941,6 +945,7 @@ class MAPIProvider {
                 return SYNC_FOLDER_TYPE_NOTE;
             if($entryid == $inboxprops[PR_IPM_JOURNAL_ENTRYID])
                 return SYNC_FOLDER_TYPE_JOURNAL;
+        }
 
         // user created folders
         if ($class == "IPF.Note")