Corrected problem in maf_extract_ranges_indexed, which failed when a maf block contains more than one line with the desired reference sequence. The failure manifested as an abort, from the range error test in coord_to_col() in align/core.py. The correction is two-fold. First, we add a test in the script co that coord_to_col is not called with an empty interval. Second, we change the script to loop over *all* interesting reference intervals, rather than the first.