Commit Hash
70690c5

Platform
Arch Linux

Summary
I've found that when ripple deleting a few clips (possibly involving cross fades or text nodes), olive crashes.

Steps to Reproduce

1. Create a few clips on the timeline, and add text nodes and/or crossfades between them
2. Highlight some of the clips at the beginning, but not all clips
3. Shift+delete to ripple delete.

Here's one scenario that crashes:

Additional Information

I loaded up Olive in a debugger and it turns out the track variable is null on line 390:

Adding something like this fixes the crashes:

    Track *track = region.first;
    if(!track) {
      qWarning() << "Track is null!";
      continue;
    }

If it's not supposed to be null, then we got other problems but it's a good idea to check for null here in any case.