Fix updating message existence to 0
Fix updating message existence to 0

rogerthat-platform/rogerthat-ios-client,rogerthat-platform/rogerthat-ios-client,rogerthat-platform/rogerthat-ios-client,rogerthat-platform/rogerthat-ios-client,rogerthat-platform/rogerthat-ios-client,rogerthat-platform/rogerthat-ios-client,rogerthat-platform/rogerthat-ios-client