Segfault due to faulty xml import

Segfault happens on SVG export of the attached file, (mscore AllOfMe.xml -o aom.svg).
Digging into it is caused by _numOfDashes being 421660560 for a LyircsLineSegment.

An easy hotfix to stop segfaults is to edit LyricsLineSegment::LyricsLineSegment(Spanner* sp, Score* s) to set _numOfDashes(0) (and this will stop the segfault),
but the real underlying problem is that for some reason, layout is not called on the element before drawing. As the problem is fixed when the file is first converted to .mscz and then exported to svg, I assume it is due to an xml loading issue.