* font/font.c (find_glyph): Check that bmp_idx is available before using it. (grub_font_get_string_width): Never call grub_font_get_glyph_internal with (font == NULL).
* font/font.c (find_glyph): Check that bmp_idx is available before using it. (grub_font_get_string_width): Never call grub_font_get_glyph_internal with (font == NULL).