Don't crash if an X terminal is deleted with force == t.
* xftfont.c (xftfont_end_for_frame): Just return if dpyinfo->display is NULL. * xterm.c (x_delete_terminal): Set dpyinfo->display to NULL. * frame.c (frame_make_pointer_invisible) (frame_make_pointer_visible): Just return if there isn't any selected frame.
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