[BUG] No way to exit dialogue if a dialogue response exists.

[blueknightone]

Describe the bug
If you create a dialogue node with a choice (say if you want an choice button that has a custom label), the choice button throws a "mismatched number of links and responses" and no choice button is generated.

To Reproduce
Steps to reproduce the behavior:

1. Create a new dialogue container
2. Create a single Dialogue Node and link it from Start
3. Add a choice to the dialogue node
4. Save the dialogue and try to run it.

Expected behavior
The choice button with the custom text should appear and clicking on it should end the conversation.

Desktop (please complete the following information):

• OS: Windows 10 Pro
• Unity Version 2019.4.13f1

Additional context
Add any other context about the problem here.