[MusicXML Import] Crash if stop wavy-line is missing

[tsjam23]

Issue type

Crash or freeze

Bug description

Musescore crashes if open broken musicxml file where <wavy-line type="stop"> is missing.
I guess every wavy-line should have an ending pair:

<!-- start part-->
<notations>
   <ornaments>
      <trill-mark/>
      <wavy-line type="start" number="1" default-y="12.50"/>
   </ornaments>
</notations>
<!-- some other xml elements -->
<!-- end part -->
<notations>
   <ornaments>
      <wavy-line type="stop" number="1"/>
   </ornaments>
</notations>

But in case end part is missing, Musescore should't crash and somehow handle this situation: ignore ornament or display warning message
It was reported here https://musescore.org/en/node/354428

Steps to reproduce

1. Download attached sample or real score here
2. Try to open it with Musescore 4.1.1

Screenshots/Screen recordings

No response

MuseScore Version

MuseScore version (64-bit): 4.1.1

Regression

I don't know

Operating system

Windows 10

Additional context

Sample file to reproduce crash
musicxml_open_crash.zip

[Jojo-Schmitz]

See #19329

Apparently a regression vs. Mu3

Similar to my PR 3.6.2 seems to ignore that trill without an end.
OTOH my 3.7 does not and gives this debug output:
Debug: Trill ticks changed, -1 -> 480 (...\libmscore\spanner.cpp:668, void Ms::Spanner::computeEndElement())

[Jojo-Schmitz]

#18766 fixes this