Throw an exception if a template ID does not exist in your request body

[thinkingserious]

Issue Summary

You will not receive an error from the API is you send an email with the wrong template. Instead you will get a "Not Delivered" notice in your email activity feed. We want to make that experience better by throwing an exception in the code instead.

This issue is inspired by this.

Acceptance Criteria

• Use the API to verfiy a template ID exists, if not, throw an exception
• A new test is added that demonstrates that if you use a non-existent template, the code will throw an error

[rishacha]

Hi, Can I take this up?

[mvarrieur]

I think your link to the API is incorrect in the description of this issue FYI

[10kc-zack]

@thinkingserious To confirm, would this change add another HTTP request when sending mail with @sendgrid/mail? If so, I don't agree that it should be the solution. In my mind, the SendGrid API should be changed to return a detailed error stating that the template ID doesn't exist.

[thinkingserious]

Since there has been no activity on this issue since March 1, 2020, we are closing this issue. Please feel free to reopen or create a new issue if you still require assistance. Thank you!