If a user has a period in the name of their widget and they then copy and paste that widget the editor will crash

Steps to Reproduce
  1. Open Editor
  2. Create a new widget blueprint
  3. Add a text widget to the designer tab
  4. Name the widget "." (no quotes)
  5. With the text widget selected copy and paste is with Ctrl+C, Ctrl+V
  6. Notice the editor crashes

Expected: The editor will throw an error when trying to use a period in the name of a widget or the editor will not crash when one is used
Result: Editor crashes when copying and pasting a widget with a period in the name

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ComponentUE - Editor - UI Systems
Affects Versions4.8.3
Target Fix4.10
Fix Commit2652550
Release Commit2712981
CreatedAug 3, 2015
ResolvedAug 12, 2015
UpdatedJun 23, 2016