CRM-12614 adding empty mysql.tpl file for 4.3.4 release. Seems like this is...

CRM-12614 adding empty mysql.tpl file for 4.3.4 release. Seems like this is still required in order to user postUpgradeMessage function for a release.

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* CRM-12614: Password required again for CLI cron
  http://issues.civicrm.org/jira/browse/CRM-12614

CRM/Upgrade/Incremental/sql/4.3.4.mysql.tpl

+{* placeholder file for upgrade*}