Cancelling a split causes it to split to still create

Issue Summary

If you are in the Split Story dialog and click the X in the top-right on the second screen, implying a cancellation, the story still splits… If you hit the Back Button at the bottom, the story splits, there is no way to decide not to split at this point.

Steps to Reproduce

1. Open a story
2. More Options
3. Split story
4. Add description and click split
5. On the next window click the the white X or the back button

Expected Results

Users need a way to back out of the Split Story window that won't cause a story to create and become split

Actual Results

Created a split story even though the user clicked X and back

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available