gnucash maint: [gnc-report] Handle default_font_family being NULL

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/b9d6fc9f (commit)
	from  https://github.com/Gnucash/gnucash/commit/b8dad64b (commit)



commit b9d6fc9f4f0e7557efe27259c37b992ecbcf3664
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sat Jul 31 21:11:56 2021 +0800

    [gnc-report] Handle default_font_family being NULL
    
    There was invalid assumption in afea6fd68. According to the following
    documentation, pango_font_description_get_family can return NULL, and
    g_strdup (NULL) also returns NULL.
    
    https://docs.gtk.org/Pango/method.FontDescription.get_family.html



Summary of changes:
 gnucash/report/gnc-report.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)