[CRASH] if nesting is attempted

[Triffen]

Commit Hash Olive 0.2.0-7fa69ea5

Platform Manjaro Linux, KDE, X

Summary With my project, I select several Title clips and attempt to Nest them. Crashes immediately.

Steps to Reproduce

1. Open included project
2. Select any clips (tried several Title clips, with or without the audio clips)
3. Choose 'Nest' from the context menu

Crash Report

Uploading NestingOliveCrashReport.txt…

Additional Information Project file: ReducingSeamAllowanceFingerlessGloves.zip

perf.data.zip