Fix crash with bidi display on the last empty line (bug#6030).
xdisp.c (display_line): Don't assume 2nd call to get_next_display_element cannot return zero. (Bug#6030) Move code that bidi-iterates out of display property to a separate function. xdisp.c (iterate_out_of_display_property): New function, body from pop_it. (pop_it): Use it.
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