Using copy and paste twice with a button named "<" with a child attached to it of text name ">" will cause a crash

The user can use special character when naming widgets in widget blueprints which can cause some issues. In this case naming a button "<" and adding a child text block to the button named ">" will cause a crash if copied and pasted twice.

1. Open Editor
2. Create new Widget blueprint
   Right click Content browser > User interface > Widget blueprint
3. Open Widget blueprint
4. Drag a button into the designer tab via the Palette panel
5. Name the button "<"
6. Drag a text block into the designer tab via the palette panel
7. Name the text block ">"
8. Copy and paste the button two or three times
9. Notice the editor hangs and then crashes

UMG copy/pasting button with text named one of many characters causes phantom button