-Fix-ish: do not crash when trying to show an error about vehicle in a NewGRF and the NewGRF was not loaded at all


git-svn-id: svn://svn.openttd.org@26699 6aa0318a-3be1-0310-93fa-89fd2396df07
-Fix [FS#6066]: incorrect saving of order backups


git-svn-id: svn://svn.openttd.org@26700 6aa0318a-3be1-0310-93fa-89fd2396df07