Update bot templates to stop sending a message on error, when the activity is not a message directed to it

[aosolis]

Describe the bug
We have a problem in Teams with bots replying to an invoke or conversationUpdate activity unexpectedly, which shows up as spam messages to the General channel. One source of this spam are bots that indiscriminately reply with an error message in their error handler.

Could we update the TTK templates to handle this error condition correctly? Patterns like

TeamsFx/templates/ts/default-bot/index.ts

Line 47 in da2c454

// Send a message to the user

are problematic when the error happens in the context of an activity that's not a message directed at the bot.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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VS Code Extension Information (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

CLI Information (please complete the following information):

• OS: [e.g. iOS8.1]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

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[therealjohn]

@aosolis and I chatted about this and a message type check works well. The code can be improved like this:

const onTurnErrorHandler = async (context, error) => {  
     console.error(`\n [onTurnError] unhandled error: ${error}`);

    // Only send error message for user messages, not for other message types so the bot doesn't spam a channel or chat.
    if(context.activity.type === 'message') {
        // Send a trace activity, which will be displayed in Bot Framework Emulator
        await context.sendTraceActivity(
          "OnTurnError Trace",
          `${error}`,
          "https://www.botframework.com/schemas/error",
          "TurnError"
        );

        // Send a message to the user
        await context.sendActivity("The bot encountered an error or bug.");
    }
};

With this change an error message outputs as a message only when a user is messaging the bot. Other activity types like conversationUpdate, invoke, etc. won't result in an error in the chat.

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[qinezh]

@aosolis the bot template is updated in latest Teams Toolkit (v5.6.0), please feel free to have a try😄 (For C#, the bot template changes will be released along with VS 17.10 Preview 3)