gnucash unstable: Fix python test failure on Travis.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/41656c92 (commit)
	from  https://github.com/Gnucash/gnucash/commit/c6ae007b (commit)



commit 41656c920e54f9e4f7693086a410372257229b00
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Nov 28 17:57:00 2017 -0800

    Fix python test failure on Travis.
    
    It seems that there are two possible exceptions depending on OS.



Summary of changes:
 bindings/python/tests/test_numeric.py | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)