Caldav: Revert commit 765, VTODO events have a null instancetype

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@847 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/exchange/ExchangeSession.java

@@ -1738,6 +1738,8 @@ public class ExchangeSession {
         String searchQuery = "Select \"DAV:getetag\", \"http://schemas.microsoft.com/exchange/permanenturl\"" +
                 "                FROM Scope('SHALLOW TRAVERSAL OF \"" + folderPath + "\"')\n" +
                 "                WHERE (" +
+                // VTODO events have a null instancetype
+                "                       \"urn:schemas:calendar:instancetype\" is null OR" +
                 "                       \"urn:schemas:calendar:instancetype\" = 1\n" +
                 "                OR (\"urn:schemas:calendar:instancetype\" = 0\n" +
                 dateCondition +