gnucash maint: Bug 797389 - Random Crashes while attaching a document.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/78d4d60b (commit)
	from  https://github.com/Gnucash/gnucash/commit/49507484 (commit)



commit 78d4d60b9c13f4d2c2df934ad32502c203263aa3
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Sep 3 16:11:27 2019 -0700

    Bug 797389 - Random Crashes while attaching a document.
    
    Fixes the immediate cause, dereferencing the return value of
    gnucash_style_get_cell_dimensions, which can be NULL, without
    checking.



Summary of changes:
 gnucash/register/register-gnome/gnucash-header.c        | 5 +++++
 gnucash/register/register-gnome/gnucash-sheet-private.c | 6 ++++--
 gnucash/register/register-gnome/gnucash-style.c         | 4 +++-
 3 files changed, 12 insertions(+), 3 deletions(-)