gnucash maint: Follow up to Bug 798098 fix

[Robert Fewell]

Updated	 via  https://github.com/Gnucash/gnucash/commit/2e5c419c (commit)
	from  https://github.com/Gnucash/gnucash/commit/8441aa86 (commit)



commit 2e5c419c9e076273832ee6f870d4c520a53d561d
Author: Robert Fewell <14uBobIT at gmail.com>
Date:   Sat Feb 13 11:37:20 2021 +0000

    Follow up to Bug 798098 fix
    
    If there are GncMainWindows that have no pages added and Gnucash is
    quitted they are not destroyed. This fix checks for windows with no
    pages and then does a gtk_widget_destroy on them.



Summary of changes:
 gnucash/gnome-utils/gnc-main-window.c | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)