gnucash master: Fix crash from dereferencing nullptr when TZ isn't set.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/081d6ec0 (commit)
	from  https://github.com/Gnucash/gnucash/commit/9fc6119d (commit)



commit 081d6ec037649427adb2f98032e92f87346182cf
Author: John Ralls <jralls at ceridwen.us>
Date:   Mon Sep 26 17:55:45 2016 +0200

    Fix crash from dereferencing nullptr when TZ isn't set.



Summary of changes:
 src/libqof/qof/gnc-timezone.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)