Zabbix Server and Zabbix Proxy are crushes while ODBC check

Zabbix Server and Zabbix Proxy processes are crushes when do ODBC check of item with missing macros value.

Steps to reproduce:

1. Create an Database Monitor item to PostgreSQL
2. Use a key like this 'db.odbc.select[some_name,,"Driver=PostgreSQL;Server=server;Port=\{$PG.PORT};Database=postgres"]'
3. Do not define {$PG.PORT} anywhere
4. Proxy or server will crush trying to execute this check