convert musicxml from regression testing gives errors

[Thomas Spuhler]

This was created with version 2.15.30

$ musicxml2ly lily-1f180798.xml 
musicxml2ly: Reading MusicXML from lily-1f180798.xml ...
Traceback (most recent call last):
  File "/usr/bin/musicxml2ly", line 2984, in <module>
    main()
  File "/usr/bin/musicxml2ly", line 2979, in main
    voices = convert (filename, options)
  File "/usr/bin/musicxml2ly", line 2880, in convert
    tree = read_musicxml (filename, options.compressed, options.use_lxml)
  File "/usr/bin/musicxml2ly", line 2871, in read_musicxml
    return read_xml (io_object, use_lxml)
  File "/usr/bin/musicxml2ly", line 2823, in read_xml
    doc = minidom.parse(io_object)
  File "/usr/lib64/python2.7/xml/dom/minidom.py", line 1914, in parse
    return expatbuilder.parse(file)
  File "/usr/lib64/python2.7/xml/dom/expatbuilder.py", line 924, in parse
    result = builder.parseFile(fp)
  File "/usr/lib64/python2.7/xml/dom/expatbuilder.py", line 207, in parseFile
    parser.Parse(buffer, 0)
xml.parsers.expat.ExpatError: syntax error: line 1, column 49