A minor issue in the Empty Bot example

[zxyanliu]

Describe the bug

I created an EmptyBot using the EmptyBot sample.
There is a Send a response action (which does not exist in the previous releases) in the Greeting's trigger.
I tried to edit the LG in the Send a response action and generated an error.
I was updating this doc.

Version

Latest master branch.

Browser

• Chrome

OS

• Windows

To Reproduce

Steps to reproduce the behavior:

1. Create a bot using the Empty Bot template.
2. Click on 'Greeting' trigger
3. Select the Send a response action
4. Edit the LG file in the inline editor
5. See the error

Expected behavior

Should be able to edit the LG file in the Send a response action.
Proposed solution: Should get rid of this pre-defined action. It is a template defined as a common template (see Bot Responses -> All)

Additional context

The Send a response action is something new. There is not such an action pre-defined in the sample in the previous releases.

[cwhitten]

Todo:

• Fix the EmptyBot & EchoBot samples to utilize the inline SendActivity template and call the resuable WelcomeUser lg template
• In all samples, change name of reusable LG template from help to WelcomeUser and update any callsites where help is invoked to WelcomeUser
• Pluck off a few samples to test updated behavior

[cwhitten]

addressed via #2864