Throbber widget could eat up all of your RAM

A user has reported that they could BSOD (Blue Screen Of Death) their computer by putting in 999999999999 as the number of pieces for the throbber widget. While I was unable to produce this on our side, I did find that it will max out the RAM. Some sort of limiter could be useful.

NOTE: Engine becomes unresponsive and has to be close via task manager.

1. Open attached project
2. Open Throbber Test Widget
3. Click on Throbber
4. Add 999999999999999999999 to the Number of pieces field
5. Notice the engine freezes
6. Bring up Task manager
7. Go to the performance tab
8. Notice all the RAM is being taken up (May take a minute to hit 99%)

[4.6.1] UMG eats up all RAM with the following steps!