Fixed a crash when trying to find an Instrument's Exchange's timezone, when the exchange isn't set.
Fixed a crash when trying to find an Instrument's Exchange's timezone,
when the exchange isn't set.

underwater/qdms,qusma/qdms,underwater/qdms,KBurov/qdms,leo90skk/qdms,leo90skk/qdms,Jumaga2015/qdms,qusma/qdms