Removed the exit call if create_desktop_background_scroll encounters something else than an image. Also added safty to the main function.
Removed the exit call if create_desktop_background_scroll encounters something else than an image. Also added safty to the main function.

Signed-off-by: Daniel Josefsson <39de2513b1a474ee067ce869a97f28281704a6b2@gmail.com>

mikuyves/nasa-apod-desktop,randomdrake/nasa-apod-desktop