Running QEMU with "-vga help" crashes if there is no default VGA card
Current QEMU (v7.0.0-rc3) crashes with a segmentation fault in case it is run with "-vga help" for architectures that do not have a VGA card by default, e.g.:
$ ./qemu-system-s390x -vga help
Segmentation fault (core dumped)
or:
$ ./qemu-system-tricore -M none -vga help
Segmentation fault (core dumped)
The code seems to be crashing in select_vgahw() if get_default_vga_model() returns a NULL pointer.