gnucash maint: Fix misplaced try block that caused unhandled exception if year out of range.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/5708707f (commit)
	from  https://github.com/Gnucash/gnucash/commit/5389aa22 (commit)



commit 5708707f6c30702e1382d1e528298ae0472c7360
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri May 25 09:18:06 2018 -0700

    Fix misplaced try block that caused unhandled exception if year out of range.



Summary of changes:
 libgnucash/engine/gnc-datetime.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)