Merge pull request 'Fixed crash' (#352) from YanTheKaller/ubinstall-gtk:master into master

Reviewed-on: #352

source/ubinstall-gtk-page-switch.c

@@ -68,6 +68,7 @@ enum YON_PAGES yon_page_get_prev(main_window *,enum YON_PAGES page){
         case YON_PAGE_SECTIONS: return YON_PAGE_LICENCE; break;
         case YON_PAGE_OS_COMPONENTS: {
             char *install_type = config(AUTOINSTALL_TYPE_INSTALL);
+            if (!install_type){ install_type = "fast";}
             if (!strcmp(install_type,"fast")){
                 return YON_PAGE_INSTALL_COMMON; break;
             } else if (!strcmp(install_type,"next")){