Handle invalid offset values in the meta file

[brend32]

Describe the bug
The browser stucks when trying to load events

To Reproduce
Steps to reproduce the behavior
or a code snippet containing the scene that causes the problem:

1. Set targetTime to null in meta file
2. Open project

  EditableTimeEvents.ts line 100
      if (changed) {
        event = newEvent;
        this.lookup.set(name, event);
      }
    }

    this.registeredEvents.set(name, event);

   -> return event.offset; // NaN forces infinite loop without possibility to recover

       fix:
       return event.offset ?? 0;
  }

Expected behavior
Fallback to default values

Console errors
Browser not responding

Package versions:
3.15.2

• core: 3.15.2

[aarthificial]

Did the editor itself generate these null values? Or did you just insert them manually to check what would happen?
If there's some weird behavior causing these nulls to appear in the meta file we should also investigate that.

[brend32]

Did the editor itself generate these null values?

I think no. I wanted to fix labels losing timings when using multiple scenes. And I changed signature from targetTime to duration. When updating and moving projects from this version I forgot to delete meta file from second scene that caused infinite loop (two scenes had invalid meta but I deleted meta only for one scene).
Invistigated farther putting null don't break app, invalid number breaks. Also it will stuck for long time if you put large numbers, couse waitFor need yeald all this time to reach scene end. Don't know if there is easy fix, but if it is possible to give browser control back every 10 seconds it would be nice